I have always preferred Fifa over Pro Evo until recently that is.
I picked up 08 for a couple of quid and was very impressed, it didnt take long before i got the hang of it, but now i found that the matches are not that realistic, when you can beat Inter 5-0 who are top but lose to Napoli 1-0 who are bottom and you don't really need to add to your team either. Thankfully the same cannot be said about 09's installment.
Now I was put off this right from the start by playing the demo and reading various reviews but after receiving it as a present recently i am now hooked! Awesome graphics, fantastic detail (being a Liverpool fan i'm well impressed with how life like the team look not to mention the detail on the kit) and the playabilty is immense i now find it a lot harder to score, you really do have to pass the ball around and think about what you are doing instead of taking the whole team on and slotting it nicely in the corner of the goal as i found out with Torres in 08. The Edit facility is endless i am really enjoying changing all the kit's and moderninsing the teams and players (sad i know). I have yet to play online, become a pro or take part in the champions league but if it is anything as good as what i have seen so far i can't wait. All i'll say with this game is make up your own mind, don't be to hasty give it a try, you'll enjoy it.