PES with friends is the best
Coz in PES the defense is not like in Fifa - pressing shoot button and wait -, but you have to control your player well too. So it is easier to make moving tricks if your opponent is not pro like me xD And the players respond better (quicker) so you can make very nice attacks, like when your opponent doesn't know where the ball is and is always behind you by 1 step
I really like PES series! I started with PES 2006. Once a guy told me that try it.. I installed it but I didn't like it, coz I couldn't shoot any goal on professional mode (always 0-0 matches). So I continued playing fifa XY. But we used to play fifa with my friends that time and somehow we tried PES 2006, coz I didn't delete it. And after the first game we felt the difference and fifa was deleted. My favorite one is PES 2008, coz there I really managed to learn how to play with Juventus
I liked to shoot damn big goals with Nedved there.
After PES 2010 I got bored with football games. Once I tried PES 2011, but it was too slow after the older ones.. was slow and boring like the Hungarian league (now it is better xD). Unfortunately I couldn't play with PES 2012, coz it said that "I won't run on your notebook vga, fu!". :/ But now I installed PES 2013 and it runs well and it's kinda good game. I think Konami did a good job now. I've shoot some damn nice goals again
btw since Fifa 07 I haven't tried one of the new ones. I heard that it changed a lot to be similar like PES, but I simply don't care what they are doing since PES is good enough for me.