I've been playing the FIFA series since its 2002 WC edition till FIFA 08. In between, I got a taste of PES 4, but my system was unable to run it properly, so back to FIFA I went. Then a system upgrade followed and in came FIFA 08. However, once I played PES 2007, I got stuck on it!! I haven't played FIFA in months!! I even downloaded Euro 2008 but it's just lying around now. It's exam time, so only 2-3 matches in a day now.
For true football gaming, PES rules!! For a casual kickabout, FIFA is better!
In PES so many fake clubs which we dont find in Fifa series(copyright).
You can get option files on the Internet which replace the fake items with original ones, even the club symbols and stadium names.