This is something I've been having difficulty with lately. I feel like anti airs as a whole in this game are fairly weak and that jump ins are a little too strong. That being said, Cages uppercut is best when the opponent is simply crossing you up. It has really good vertical but will have a hard time anti airing anyone jumping in from a distance. In that case, I tend to either back dash, trip guard, or d4. They are all very situational and dependent on who your opponent is using.