They both are very similar to me, since I'm not too into memorizing the technical standards of each. Sony, in the past, has always had games I've enjoyed more as exclusives on their system, so for personal preference I simply went with the ps3. However, there are great games for both so you can't go wrong. I liked not having to buy a separate dvd player though, since I have no dvd player I can just use my ps3.
I definitely prefer soccer. It's much more fun to watch and it keeps moving the whole time, rather than 2 seconds of live play and then everything stops for another minute or 2 while they walk around and set back up...very boring.