I'm a HUGE BJ fan, but I am a bigger GSP fan. The only reason why GSP got busted up in his fight with BJ, was becasue he got thumbed in the eye pretty bad in round 1. He was able to recover and win decisevly.
I doubt these two will fight again, but if they did, I give a slight edge to GSP. I would much rather see a BJ/Huges rematch.