Pes has much to improve in CPU AI as well, both are poor in this very important aspect, but I think PES does much better in compactness and pressure in the box.
In both games, CPU AI passing is "too" assisted, you feel that players don't have any effort to make a strong and quick pass in long distances (play Pes demo2 against Real Madrid and Fifa demo against Juventus), it always reachs the attack less than 1 secound and the ball hardly loose speed, but in this case Fifa is worse because of the fact that there's not that urgency, that reading by Ai of imminent dangerous situation in favor to the attack like in PES, where defenders close down the attacker that is going to recieve the ball close or even inside the big box, forcing them (the attakcer) to control the ball with their back at the goal, it seems that there's a little space avaliable in 1-1 betwen defender and attacker that is enough for the attacker to turn and shoot.