I just saw the post fight conference of the UFC, it seems like the UFC are very persistent on pushing the Randy Couture vs Silva fight! The two fighters are very different in styles and type of experience...so before anyone calls out a 'he'll win for sure..' lets analyze a little.......

Wanderlei Silva-
ADVANTAGES:
Extremely powerful, both striking and grappling...many think he's just a strong striker but he's proven before that he's at no risk when put on his back...he is actually a strong striker when he's on the bottom!!! Very aggressive and very brutal....too strong for anyone his weight in Pride!!
He mentioned on the brazialin magazine site Tatame that he developed a new training that makes his punching power much stronger...and guess what? after he mentioned that he brutally KO's his opponenets easily with very few punches...he has that one hit KO power. Good clinch fighter
DISADVANTAGES:
His fighting style strongly favours Pride rules! he cannot do very well without kicking and kneeing downed opponents and using his stomps! He has been unfortunate in the cage before because of restricting rules. He's great as long as the rules are like pride rules! Can be taken down easily.

Randy Couture:
ADVANTAGES:
Over-experienced, easily closes the distance on strikers, excellent takedowns, and excellent ground game! Ground and pound genious...very confident and his fighting style is designed to take advantage of the octagon. Can work both on top and on the bottom, and he can strike very accuratly. Excellent clinch and excellent cardio.
DISADVANTAGES:
many losses when fighting in a ring in the past! fighting style is at a disadvantage in the ring. Striking power is not like wanderlei.


I say its all abotu the rules they fight in, wanderlei would win in the ring, couture would win in the octagon. In UFC rules wanderlei is too conditioned to pride, he would easily get disqualified.