Stream Fortnite or Gta5 online?
Fortnite is currently watching 150,000 people, GTA Online 115,000.
So Fortnite is a little more popular. I personally find GTA nicer as a game because you can do a lot of different things (especially with friends).
Neither of them. Better play alone for yourself.
You can only do one or both. Only if you do one thing will you build fans for her. If you then only (stream) the other game, e.g. Because the other one is no longer bucking, you will lose more or less viewers. (So if you change completely)
What you enjoy most.
Anyone who only goes by views is not considered personable.