I don't like having characters in my roster with bad AI. So I tend to use an easy, a medium, and a hard character to get a range. If my character's ai beats a character that I think is just ridiculous, I make my character's AI dumber. I don't want them to be cheap or dumb, or else I just got lazy, and everyone suffers for it. The Juggernaut ***** is the highest difficulty I'll allow my character to beat, but even then it needs to be a really close call. I'll also use Cloud by Infinite because I consider his AI to be pretty cheap, spamming the same move, and I'll see if my character's AI will beat a spamming character sometimes. If it's a 50/50 ratio on something like that, I know I'm headed in the right direction ^^