Well, Scorpion's HKHKLKLK combo is different thank Human Smoke, but that isn't really an advantage. In MKT he has a front teleport, which can be useful for building up nice combos, but it pails in comparison to Human Smoke's pop up dial combos. Those are what make him the better version. Scorpion is kinda pointless in UMK3, but he is definitely more unique in MKT. And yeah, picking Scorpion can be more fun sometimes ^^.