Short answer: choose Instagram Ads when your product is visually compelling and your audience is under 40, and Facebook Ads when your audience skews 35+ and you need lead forms, events or local reach. Because both run on Meta's platform, the strongest option for most advertisers is Advantage+ placements across both - which often produces a lower cost per acquisition than manual placement selection, though it should be tested account by account.
Instagram and Facebook are both owned by Meta, run on the same ads platform, and often deliver ads to both networks simultaneously. So why does it matter which one you focus on? Because the audiences, content formats, and buying behaviours are meaningfully different - and understanding those differences is the key to maximising your return on ad spend.
The Audience Difference
Facebook: Skews 25 - 55+. Strongest for local businesses, community groups, events, and lead generation. Users engage with longer-form content, articles, and group discussions.
Instagram: Skews 18 - 40. Strongest for visual brands, lifestyle products, fashion, food, and aspirational content. Users expect high-quality visuals and engage through Stories, Reels, and carousel posts.
When to Prioritise Instagram Ads
- Your product is visually compelling (fashion, food, design, travel)
- Your target audience is under 40
- You have strong visual assets (photography, video, user-generated content)
- You are building brand awareness and aspiration
- You sell directly through e-commerce
When to Prioritise Facebook Ads
- Your audience skews 35+ (medical, legal, financial services)
- You need lead generation forms (Facebook Lead Ads are excellent)
- You are promoting events, community content, or local services
- You want detailed targeting through groups and interests
- Your creative is more informational than visual
The Best Approach: Advantage+ Placements
In most cases, the smartest strategy is to let Meta's algorithm decide. Using Advantage+ placements, your ads are automatically shown on Facebook, Instagram, Messenger, and the Audience Network based on where they perform best. In many accounts this produces a lower cost per acquisition than manual placement selection, but it is worth testing rather than assuming.
Creative Considerations
Even when using Advantage+ placements, optimise your creative for each platform:
- Instagram: 9:16 vertical video for Reels/Stories, polished visuals, minimal text overlay
- Facebook: 1:1 or 4:5 for feed, more text-heavy creative works, longer captions
- Both: Strong hook in first 3 seconds, clear call-to-action, mobile-first design
The Bottom Line
Instagram Ads and Facebook Ads are not an either/or decision - they are channels within a single platform that serve different purposes. The most effective social media advertising strategies use both platforms strategically, with creative tailored to each audience.
Not sure how to allocate your Meta Ads budget? Talk to our team for a personalised recommendation.
Creative production: the real cost difference
Before allocating budget between the two feeds, look at what each actually demands from your creative pipeline. Instagram placements reward fresh, native-feeling video shot specifically for Reels and Stories - stock photography and repurposed print assets tend to underperform because the format signals "ad" immediately. Facebook feed placements are more forgiving of static imagery, product shots and text-led carousels, which is one reason service businesses with limited video budget often get more consistent results there.
If you only have capacity to produce one set of assets, shoot vertical video first. It can be cropped down for the Facebook feed, but a horizontal or square asset shot for Facebook rarely looks native once it is force-fit into a 9:16 Reel. Budget for a monthly or quarterly shoot day rather than a single one-off, because ad fatigue sets in faster on Instagram than on Facebook - the audience scrolls more content per session and recognises repeated creative sooner.
Testing placements properly
Advantage+ placements will happily spend your entire budget on whichever surface is cheapest to serve, which is not always the surface that produces the enquiry or sale you actually want. A more disciplined approach is to run a short manual-placement test alongside your Advantage+ campaign: split a modest slice of budget into an Instagram-only ad set and a Facebook-only ad set, using the same creative and audience, and let it run long enough to clear the learning phase before comparing.
What you are looking for is not just which placement is cheaper per result, but whether the leads or sales it produces are the ones your sales team actually wants to follow up. A cheap Instagram lead that never answers the phone is not a win. Document the test period, the spend split and the outcome so the next placement decision is based on evidence specific to your business rather than a general rule of thumb about platform behaviour.
This kind of structured testing is also where a specialist social media marketing partner earns their fee - not by guessing which platform "should" work, but by running the comparison and reporting it back in plain terms.
Setting up measurement before you spend
Neither platform can tell you whether a click became a customer unless you have told it what a customer looks like. At minimum, before launching, confirm the Meta Pixel or Conversions API is firing on your actual conversion event - a form submission, a phone click, a completed checkout - rather than just a page view. Businesses that sell over the phone should also connect call tracking, because Meta's own reporting will otherwise undercount every lead that rings instead of filling in a form.
Set up a simple weekly review: spend by platform, cost per result, and - critically - what happened to those results once they reached the business. A lead form on Facebook and a link-in-bio click on Instagram are not directly comparable unless you follow both through to a booked job or a completed sale. This is where the lead generation side of the account and the ad platform need to talk to each other, ideally through a shared CRM field that tags the source of every enquiry.
If in-platform reporting and your own sales figures disagree, trust the sales figures. Attribution models on both platforms have become less precise since Apple's tracking changes, so treat Meta's reported results as a directional signal rather than an exact ledger, and reconcile against your bank account or booking system at least monthly.
Questions to ask before you brief either platform
- What does a qualified lead or sale look like for this business, in specific terms - not just "an enquiry"?
- Do we have enough native vertical video to support an Instagram-led strategy, or should we start on Facebook while we build that library?
- Is our tracking set up to follow a click through to a phone call or in-store visit, not just a form submission?
- How often will placement and creative performance be reviewed, and who is accountable for acting on it?
Businesses weighing Meta spend against other channels should also read our comparison of Google Ads vs Meta Ads, and if budget is limited, the guide to moving beyond boosted posts covers the groundwork worth doing before any paid spend.
Budget splits worth testing first
Rather than guessing a split, treat the first month as a discovery phase. Run Advantage+ across both placements at your full budget so Meta's delivery system has enough signal to learn efficiently, while keeping a small manual-placement test running in parallel as described above. By the end of the month you should have enough data to decide whether to keep letting the algorithm choose, weight the budget deliberately towards one platform, or run genuinely separate campaigns with different messaging for each.
Businesses selling considered, higher-value services often find Facebook a better home for top-of-funnel lead generation because of its lead form ad type, then use Instagram for retargeting warm audiences with more visual, brand-building content. Retail and hospitality businesses more often find the reverse works better - Instagram driving initial interest through visual discovery, Facebook picking up local intent searches and event promotion. Neither pattern is guaranteed, which is exactly why the test matters more than the assumption.
When paid social alone is not the answer
Meta advertising works best as one channel in a wider plan, not a replacement for organic presence or a properly converting website. If your ad spend is driving traffic to a page that loads slowly, is not mobile-optimised, or does not clearly explain the next step, no amount of placement testing will fix the underlying conversion problem. It is worth having your website reviewed alongside your ad account so the two are working together rather than one undoing the other's work.
Similarly, businesses relying entirely on Meta for enquiries are exposed if the platform changes its targeting rules or costs shift - which has happened before and will happen again. Building organic social presence and a broader content marketing foundation gives you a channel that does not disappear if a single platform's algorithm or policy changes overnight.
Where to Go Next
- Facebook advertising and Instagram advertising - platform-specific campaign management.
- Lead generation - where Facebook Lead Ads fit into a full funnel.
- Ecommerce marketing - if you sell direct and lean on Instagram.
- Facebook Ads cost in Australia - what to budget before you split placements.
