i think most people would prefer foss apps, which arent common on aurora store, becuse it only shows apps from google play. if you need a proprietry app, like banking or something, aurora store is your best bet. it is debatable where you should get an app, if it is on both aurora and fdroid, but i personally would say go with fdroid if it is on there, because you know its foss, and theres less tracking. technically, you shouldnt need a google account to use aurora store, but i have had problems with the anonymous login, so im not sure. other than that, grapheneos does not need a google account connected to anything, by default. if you want to run google apps, like drive or docs, i believe they rely on ‘google play services’, which can certainly be set up on grapheneos, but you will need a google account, so its best avoided imo. also: the ‘droid-ify’ app is a nicer frontend to ‘f-droid’, and they use the same main app repository. some apps, like signal, are only available through aroura/play or downloading an .apk, but one installed, i think it automatically updates itself. hope this helps