Cho'gath in my opinion is also one of the best junglers in the game, up there with Nocturne, Udyr, and Fiddlesticks. I pick up a Cho'gath jungle when my team needs a tank. He's just really versatile, great ganks, great sustainability, and a good clear time. Another really great quality about him is that he doesn't need the blue buff in order to jungle. The blue buff is basically just for the xp, so it won't completely fuck up your early game if you get ganked there (unlike Amumu. He's an amazingly overrated champion).