I think the way it is now (or the way it could be with the XBOX 360 release), there's going to be things that EA do better, and things that Konami do better, and this year it may turn out pretty much equal.
For example...
+ In Pro Evo, you've got no room to fart. In FIFA, you can play a normal passing game.
+ In Pro Evo, the defenders catch-up with strikers like pumas. In FIFA, it's realistic - if they dummy you and get past you, you're toast.
+ In Pro Evo, before the game is even RELEASED, you know you've "completed" it years and years ago, as the competitions are exactly the same. In FIFA, it would take you months and months to go through every competition.
+ In FIFA, the shooting is quite erratic. In Pro Evo, it's instinctual.
+ In FIFA, the movement using the D-pad is unreliable. In Pro Evo, it's (arguably) the best way to play.
+ In FIFA, goalkeepers on the hardest mode are supermen. In Pro Evo, they're nowhere near as dodgy (although still quite dodgy).
The way I see it, I've played Pro Evo for years and finished the Master League so long ago I can barely remember much else from that time. This year, the gameplay of FIFA is on an exact level to Pro Evo's - i.e., it's fantastic in some areas, and flawed to say the least in others.
My first choice this year will be FIFA, a game based on football but a game I've not played before; a football game with so much to do.