ISS Pro
If both were compared ISS may actually be the hardest in the whiole pro series, even Pro Evo 5 on the current Playstation 2, which makes you really play. But on ISS you were not even given time, even on Medium which is about 3 star now, but if you put a couple of passes together and getting towards the goal, the defence would always find a way of stopping you and then scoring on the counter attack.
I rarely played the game and in about five games I played i only scored 4, three coming in my first game with the rest draws, so i just jumped back to ISS 2 to where I was good.