Q: For a milestone like '3 pageviews', should I use an Audience trigger or a key event?

Q: For a milestone like '3 pageviews', should I use an Audience trigger or a key event?

A: Decide by whether you want to count it or build a list.

— Make it a key event when you want it counted as a conversion and sent to Google Ads for bidding — use Create event with a condition.
— Use an Audience trigger (Admin → Audiences → New → set trigger 'Log event when audience is matched') when the goal is grouping users for remarketing and you also want an event when they qualify.
— Combine them: an Audience trigger can fire an event you then mark as a key event.

TL;DR: Key event for counting and bidding; Audience trigger for building remarketing lists. Use the audience trigger's logged event if you want both at once.

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