The Short Answer: It Depends on the Job
Most people asking "what's the best LinkedIn ad format?" are looking for one answer. The reality is that different formats do different jobs, and a proper B2B SaaS campaign uses multiple formats simultaneously — each one optimised for a specific stage of the funnel.
The mistake is choosing one format and running it in isolation. Conversation ads without demand gen are expensive. TL ads without demand capture generate awareness but no meetings. The formats work together. Here's what each one does best.
Every Format, Ranked
The proven combination: 5+ TL ads running simultaneously for demand gen (60% of budget), conversation ads with incentive for demand capture (30%), and lead gen forms with Calendly for frictionless booking (10%). All targeting the same account list. This is the stack that produces SQLs at $59–$165 on retargeting audiences.
Why Most Companies Get This Wrong
The most common mistake is running only one format — usually single image ads from a company page asking cold audiences to "Learn More" or "Request a Demo." This produces mediocre engagement, expensive clicks, and very few conversions.
The second most common mistake is running conversation ads without demand generation. Yes, conversation ads work on cold audiences — but SQLs cost $154–$388 from cold versus $59–$165 from retargeting. Demand gen makes demand capture cheaper. The TL ads create the awareness that makes the conversation ad convert.
Each format has a different success metric. TL ads are measured by penetration rate and frequency, not clicks. Conversation ads are measured by SQL cost and form-to-meeting rate. Lead gen forms are measured by booking rate. Judging TL ads by their CPC or conversation ads by their CTR leads to wrong conclusions about what's working.