You mean when it comes to network only? I never had problems with the regular PSN (except for the Anonymous incident) and the Xbox Live network. 6 months ago I went for PS Plus and it's definitely worth it, getting discounts and free games all the time.
Microsoft is kinda greedy when it comes to games, the only reason I have it is for Halo & Gears Of War. They should really invest in more firstparty studio's and bring more AAA-games on the market like Sony does. I don't see how anyone who wants to play quality games goes for the Xbox unless they're fans of Halo & Gears like I am. You buy a console to play games and except for these 2 exclusives and multiplatform games Microsoft doesn't have much. I have to say there were some surprises with Alan Wake and Metro 2033.