By the moment each platform owns in your customer’s decision, not by which one looks cheapest.
Google Search is the moment of intent. Search and Shopping capture it, so we fund them first. Performance Max extends that across YouTube, Display, Discover, Gmail and Maps from one budget.
Meta owns the moment before intent. Facebook and Instagram, with Advantage+ choosing the audience, create the demand Search later captures.
LinkedIn owns the professional moment: a job title, a company size, a buying committee. It costs more per click, and when your contract value justifies it, nothing else reaches that person at work.
Amazon owns the shelf, Microsoft Advertising owns the desktop searcher Google misses, and ads inside ChatGPT are the newest moment, where the buyer asks a question instead of typing a keyword.
Our team assigns budget to moments first and platforms second, then lets marginal return move it. The platforms are stages, not rivals.
SOURCE: Google Ads Help, about Performance Max · AB Media Co practice