I like Luigi a tad bit more. Luigi has a monster truck full of combos which he could do with his down throw. He uses the fireball to temporarily lock the opponent in place so he can get the grab much easier, then after the down throw it's up to what the player decides, based on opponent DI and %. Dr. Mario is pretty cool because he is way more powerful, but he's kind of slow and his recovery isn't the best. Dr. Mario was better in Melee ;-;. So in the end I pick Luigi.