The guy who reviewed both FIFA 08 and Pro Evolution Soccer 2008 for Gameplayer has done a follow-up article that looks at how the two game shape up next to each other.
"So, it's time for the big match up. The managers have released their team sheets, set their formations and hit the paddock. Who has won the 2008 match up between the mighty FIFA and the brilliant Pro Evolution Soccer? We've now gone live with our reviews of the two games (which you can view here and here respectively) and have given the matter great thought. The last few years have undoubtedly been the domain of Pro Evolution Soccer, but in 2007, FIFA is no walkover."