would you rather have a flamer or a troll on your team

Do you mean troll as in "picks clarity AP Zed" or troll as in "picks off-meta Kha'Zix mid"?

If its the first, I'd prefer the flamer. I'd mute him, he'd probably be bad, but he would be trying to win despite the rage.

If its the second, then I'd take that "troll"