Same here: I pay contactless with a Garmin vivoactive3. It cost $30 on Craigslist, runs for ~3 days without charging. My thought was that Garmin has less "ecosystem" and is less likely to be monetizing purchase history, vs. Samsung... but I don't have any inside info.

I have the GarminConnect app in my "Google Crapola" profile, and for a few months I even deleted the app, and tap-to-pay on the watch kept working.