I use all of them, except obtanium the only problem with F Droid it takes a couple days until you get the new release of apks but that's about it but F Droid itself is actually a organization actually trying to defend open source software on Android I see way too many people attack F Droid for faults that are minor and they blow it out of proportion to me it seems like a organized attack against F Droid because F Droid is a organization that is actually trying to keep the Android ecosystem open