Predator. They're too smart. I remember at the end of Arny fighting the predator he had this self destruct thingy. Suppose 10 kamakaze predators use their invisibility thing to sneak in and detonate, boom it's all over.

But I'd expect that they do a bunch of twists where the balance is always tipping from side to side.

I fully expect that they'll not have a clear outcome like all vs type things do. For example Freddy vs Jason, Spider-man vs Superman, Superman vs Flash, etc.