- Edited
I was too slow to edit my post, so I have to make a new one.
Which store is best depends on each user's threat model. If the threat is that an app developer could insert a backdoor in their own app, F-Droid is better. If the threat is that the F-Droid team could insert a backdoor in an app, or that an app could contain a vulnerability that may be exploited if the app is not updated for one week, Accrescent is better.
If a user is willing to verify that an APK is signed by its developer using an app such as AppVerifier, and doesn't care about 0-day exploits, all the apps that have reproducible builds on F-Droid are totally acceptable. Unfortunately, that's only around 5 to 10 percent of the apps on the official F-Droid repo (the rest are built and signed by F-Droid).