And, i have been seriously contemplating abandoning Firefox b/c it has slowed down SO much over time; i'm assuming this must've been b'/c of the Zotero plug-in
Everything that's database related works exactly the same with the two. Neither works on a mobile app directly and using them with the existing apps like ZotPad and Zandy makes no difference. Word integration is the same, as are groups.
The only reason to not use ZFF and use ZSA instead when working in Word is to make Firefox run smoother.