I'll say Mosley.
His whole career is riding on this fight...if he loses,he is relegated to second tier status among today`s elite fighters...look at how De La Hoya is perceived now...Vargas....Naseem Hamed...Diego Corrales....
Also,you have to understand that if the bout is even remotely close,Mosley will get the decision....we all saw the Morales-Barrera fight and the prospect of the third big money fight is usually the determining factor in a close decision...throw in the fact that mosley is the "marquee name"with the big HBO contract.....
With all that said,i personally think that Forrest has the height,defense and power(the total style)that will give Mosley a fit every time....i might even go as far as saying Forrest is the better, more complete fighter....Mosely is flashier and gets all the press...but,i`m probably taking Mosely in what will probably be a boring,cautious second fight(see Morales-Barrera 2)to win a close decision whether he desrves it or not....third fight coming up.