Personally, i’d day neither. Mozilla is on Google’s payroll, so if you’re trying to battle Google’s monopoly, it won’t matter if you pick Firefox or Chrome (or any forks or derivatives)
If you need to pick, i would say Firefox, and Librewolf if you want a browser which is more privacy friendly and has saner defaults.
If you want to battle the monopoly, you should pick a browser that’s not based on Gecko, Blink or Chromium. Something like Ladybird, BadWolf, LuaKit or Lynx if you’re into that
How isn’t Mozilla in Google’s pocket, if the only reason they’re still around is because of Google funding them?