For the time being, it's Brown. He is a premier scorer in all phases of the game and he plays very solid defense. I just trust him more.
Tatum is more 'deadly' in that he can turn a game around from behind the arc and he is a better playmaker, but he just doesn't play with the same purpose that Jaylen does and his decision making can be questionable. Of course he is only 22 and he will probably learn to better value possessions in the future, but he just lacks a little bit of that maturity that Jaylen currently has.