Pendo, none of them do just some shorts have rubbish sews I forgot the technical word, the linen on the inside thats it. its rubbish so they just itch agaisnt your leg, just looked at them RDX shorts as my mate orderd some and he said there nice for free movement.
I think Venum are the most popular ones for MMA. Most of the guys at my MMA Gym use them, although I use Evolution Fightwear ones and don't have any trouble with them. Pretty comfy and don't restrict movement.
Mark Kerr used to have some awesome "No Fear" ones with the eyes on his butt
Fedor Emelianenko used to wear some cool ones too, they were black with a 1 inch white trim on the legs and waist. I think they said "adrenaline" on the butt. I used to want them really bad when I were a young'un