I really hate Google Analytics - especially the new version (GA4?).
I find it so hard to use. The microcopy is useless, and the fact that it doesn't track identity makes it vary hard to see anything beyond macro-trends.
My preference is to use old school SQL to report on transactional data, instead of event data. Sometimes I'll use a simple GUI like Metabase to visualise the queries and build simple dashboards.
If I'm forced to use an event-based telemetry system I suppose I'd go to Mixpanel via Segment.
My co-founder has also suggested we implement Posthog, but I've got no experience with it so far.
Hope that's useful