DeletedUser301
F-Droid vs Obtainium/GPlay/etc. is like a never-ending discussion of "native app vs PWA" :) It depends on the use case.
About the trust - I like the F-Droid approach of building the apps from the source code compared to the already compiled APK from GitHub. There is no guarantee that (random) developers use the exact source code they published on GitHub.
On the other hand - if the F-Droid infrastructure gets compromised (signing keys, etc.) it can affect all apps you downloaded/installed from its repository. And this is unlikely to happen if you use GitHub/Obtainium as you use different devs/projects for different apps.