Tyranids for myself. why? their dinosaurs crossed with alien, they reproduce faster than anythng can have any hope of killing them, to the extent of them eating fucking planets, (trillions of googleplex of tyranids)they have psycics and acid lazers and horrible barbed acid traps and, what is more;
They are going to win. orks would win if they worked together, and they wont. the forces of man are hopelessly outnumbered, the tau are young and insignificant in the grand scheme of things, and the eldar are a husk of what they used to be. tyranids are on the up, and nothing, BUT nothing, is going to fucking stop them.
Not even Charlie Sheen.