There's more to just character pick when you go to a tournament , you've gotta take in consideration first what player is using him and how much he knows the matchups , then you have to consider his bracket and the players+character he'll face , what character you pick is extremely important in a matchup heavy game like the current injustice but it's not the whole equation.
There are so many things to consider it's not even worth it , best tier list is the one made with long detailed matchup charts wich requires TIME and good representatives of each character.
That said i belive tournament placing and character selection plays a big role especially in the early stages of a FG life , ease of use also plays a big role in tournament placings , easier character = less chances to drop stuff and better payoff