The bluish-black bipedal feline thing VS the warrior-armor thing.
I'm not quite sure what these guys are supposed to be, but they're both badasses, both part Dark, and both have a crippling weakness to Fighting types. Who do you choose?
For me, I'm going with Weavile. Because I've used it and you don't have to get Sneasel up to level 52 to get one.