Well you are pretty right and that's where i'll stand and say my opinion!
PES2010's GFX won't be any better than FIFA's,believe me!
Now about the gameplay.
FIFA's problems:
*Sometimes the AI of the game changes your player and it can cause the score of goal against your team
*Sometimes the gameplay becomes faster/slower!For example:
I shoot and the opponent goalkeeper fells down to catch the ball.Once he cath it he will stay a bit down but he will get up too quickly.
*Sometimes the goalkeepers do silly mistakes
PES' problems:
*Animation problems are something that anyone can notice i guess
*Stupid goalkeeping mistakes!
Of course FIFA can be noticed as better cause of the many licenses and the graphics that it has!
If you read the whole post you will understand why i like FIFA much more!