I have a friend who is about 6'5" and over 200 lbs, and he has done both muay thai and MMA...I think he liked MMA better, although he did incorporate a lot of elbows and knees into it, so it was basically still muay thai. And though he's big, he's still really fast.
So don't discount faster martial arts just because you're big. Hell, learning a quick style might throw potential opponents for a loop, cause they'll be expecting you to come in for the brawling grapple.
So don't discount faster martial arts just because you're big. Hell, learning a quick style might throw potential opponents for a loop, cause they'll be expecting you to come in for the brawling grapple.