I tried to have a go on FIFA again last week and it was shyte.
PES wins hands down just for the variety of goals you can score. In FIFA there are so many 1-1 goals. It's almost impossible to rake in a 30 yard piledriver, defenders always block it, and nigh on impossible to put a header on target.
In PES, I've scored some superbly crafted team goals, a good few rockets from 20-30 yards out and then there are the deflected goals. Always satisfying when scrapping for a point and it takes a nick off the defender to wrong foot the 'keeper.
Like the other guy said, PES requires time, effort and patience but when the game is good, it is amazing.