Which activity provides a stronger signal of an ad's impact on a conversion.

A post-click conversion provides a stronger signal of an ad's impact because it indicates direct engagement with the advertisement. When a user clicks an ad and subsequently converts, it establishes a clear, immediate link between the ad interaction and the desired action. While other conversion types are valuable for a holistic view, a pre-view conversion (where a user converts after only seeing the ad, not clicking) can be influenced by many factors beyond the ad itself, making the ad's direct impact harder to isolate. An all-up conversion aggregates all conversion types, which is useful for overall performance but doesn't isolate the direct impact of a click as effectively as a post-click metric.