I havn't seen what the ps3 online service is like but for me xbox live is just fun and easy. I can chat to friends who are playing different games to me, i can invite them to my games at any time, i can go on msn while im playing my games and i love comparing my achievments of games to other people! All that can be done on silver which is more than enough for me as i'm not really a big online gamer but i keep the gold subscription anyway for the occasional online game.
For me though, the greatest thing about the service is the online content available through the xbox live arcade. Before i didn't really care much for small games or the retro games but now i see myself buying the occasional game such as N+, Rez Hd and Puzzle Quest which are all fantastic!
