I don't know about more versatile since most of the world champions have been Ex-collegiate wrestlers. If I am not mistaken, Randy Coutere, ex-wrestler at Oklahoma State is a 3 time world champion.
I agree...if you aren't very good at wrestling it would be hard to good at UF, Mark Coleman was a good example. Your body needs to learn balance gained from wrestling...I don't any champions who gained that strictly from jujitsu, but I don't keep up with it all that much either, it's too expensive.
As a former wrestler, it is my observation that most fights end up on the ground--which is obviously where I'm most proficient. So I opine that wrestlers make the best fighters.
Chuck Lidell KTFO of Lidell. Wrestlers are usually good at getting the guy down but know always knowing what to do once they get there.
I love UFC though. I started BJJ and its really cool.