I'd go with the triton simply for the positional audio. Its very useful for gaming, especially fps.
I use a Turtle Beach Audio advantage SRM for my pc and its similar to the triton set up. It has 4 speakers per cup that it uses to recreate positional sound. It works well for PC but unfortunatly doesnt work with the ps3.
Of those two you selected I would go with the triton for sure. True 5.1 can only be recreated in headphones with separate speakers. With video gaming I find the positional benefits of having 5.1 to be more beneficial than just really good quality headphones which I would prefer for music or movie watching.