TRON PRO has more toys than X-MEN PRO. I would probably lean to the TRON PRO cause of the spinning disk that emulates the light disk throwing wars . On TRON, that is pretty cool being up the top and behind the target bank which drops etc. X MEN PRO doesnt have any spinning moving toys etc.
Even on the X MEN LE, the spinning disk is too small and too high in a crowded position. I reckon the X MEN game should have had the spinning disk down the base of the playfield where the large blue circle is. That would have made more sense having the right swinging ramp drop balls onto a lower disk, and having the disk as big and as good as say TWISTER has, would have been a better design.
Maybe waiting for Avengers might be a better idea ? cause its out soon and you could always buy a X MEN PRO later if Avengers isnt up to scratch ?