Every since the new update I use F3X on larger projects.
For me, studio tools is way better than f3x. I tried f3x before, not in roblox studio but in games that I have admin commands. I can tell, that if building using f3x in-game is hard, than f3x in roblox studio maybe hard aswell. Its not the easiest to make detailed buildings, but if your expert at f3x, then I recommend you giving it a try.