With 137+ formats on this page, the real question isn't "which ones exist" — it's "which ones are worth MY budget, right now, for MY goal." Here's a practical decision framework, built around four questions in order.
What's the actual objective?
Awareness (reach as many relevant people as possible) calls for Display, Video pre-roll, Social feed ads, or DOOH. Consideration (get someone to engage, not just see) favors Native, Social carousel/collection, and Search Discovery formats. Conversion (get a specific action now) is Search text/Shopping ads, Retargeting/Dynamic Product Ads, and Retail Media. Retention (bring past customers back) is Email, SMS, and Retargeting again.
Who, specifically, are you trying to reach?
B2B decision-makers point you toward LinkedIn first. Younger, mobile-native audiences point toward TikTok and Snapchat. High-purchase-intent shoppers already comparing options point toward Search and Retail Media. Broad consumer awareness points toward Meta, YouTube and Display.
What's the real budget, and what does that afford?
Under a few hundred dollars a month, Meta and Search still offer the lowest realistic entry cost with meaningful reach. Mid-size budgets open up Retail Media, LinkedIn and programmatic display. Large, brand-building budgets are where CTV, DOOH, Masthead and Takeover-tier premium placements start making sense — their minimum spends alone price out smaller advertisers.
Do you have the CREATIVE this format actually needs?
Spark Ads and TikTok In-Feed need genuinely native, fast-paced video — a repurposed TV ad will underperform badly. Search and Shopping need clean product data and tight copy, not video at all. DOOH and Cinema need high-production, big-screen-legible design. Match the format to what you can actually produce well, not just to where you'd like to be seen.
One more rule worth internalizing: almost no serious advertiser runs ONE format. A typical funnel pairs a reach format (Display, Social feed, Video) with a conversion format aimed at the SAME audience once they've been exposed (Retargeting, Search brand terms, Dynamic Product Ads) — the combination consistently outperforms either layer running alone.