Maybe I don’t have a full understanding of how zapstore works. But obtainium I literally goto the repo for the app I want . 100% directly from the source. Where zapstore , you are providing me that path.. so there is an extra level of trust.
Discussion
I'm just indexing the repos and displaying them nicely. There is no difference in the trust model.
Maybe you got confused because of nostr signatures - but Obtainium provides none. APK certificate signatures are the same in both because files are the same.
A reasonable criticism is that you can't go to any repo you want. That is coming soon.