wow! what a thread we got here.
I got a question for you guys.
Which one would you rather have.
a) Body of prime Arnie.
b) Skills AND Body of BJ penn
ps: you don't get to take part in any competition (bbing or MMA) and you are living in a relatively safe country I might add.. 
Can't believe this thread is still alive. Better comparison is body of Arnie and skills and body of Frank Mir. One, strictly for show, one for combat sports. BJ is lightweight, at least compare Arnie to a heavyweight. Bodybuilders bodybuild, fighters fight. Even though I train primarilly BJJ with some kickboxing mixed in, I still like to be lean, so appearance is always going to be important. Appearance over performance, no way. Kind of like 26" rims on a sports car. Makes no sense.
I can see Mindspin's analogys, a lot of folks have opined, previously, that someone like Ronnie, Nasser, et al, would wreck shop if they got into an MMA fight, and here is where Mindspin is clearly correct. But to argue about MMA on a bodybuilding site.....

And to clarify, Chick, I was a natural bodybuilder who couldn't compete with those with performance enhancing drugs.