Aurora is an alternative to Google Play Store and has the exact apps available there. FDroid has apps that aren't in Play Store, or its a different version in F-Droid. The FDroid ALTs I know of are: Accrescent (from Graphene OS), Obtanium (pull builds straight from the git repos), and Zapstore. Not sure which is really the best solution though. I'm mostly in Obtanium though.