PC and probably PS4 over 720. The biggest reason? Xbox Live is nearly stagnant in relevant content improvements while everyone else is moving forward. The most obvious being accessibility of online play. Literally everyone is providing it for free (PSN, Wii, PC) so I find it a bit silly that Microsoft is still trying to leverage that as a selling point. For XBL's most direct competitors, PC and PSN (I exclude Wii U since that's for the most part, a different market) I can name at least one great thing about each one's online. Playstation Plus literally gives out games for free*, and Steam's game discounts are both incredibly numerous and high. Meanwhile the new "premium" features on Xbox Live are all things that are already free (Twitter,Facebook, Last.FM, Internet Browsing) and more convenient on other platforms. Microsoft has this odd fixation with bloating Xbox Live with irrelevant content rather than trying to genuinely outdo their competitors. Is Xbox Live horrible? No, but it's not great and that's just the problem. There's absolutely nothing remarkable about it at all. Most people I know who are still on Xbox Live are only still there because they're too invested by now to back out. That's really about it though. After all, what's the most unique thing about Xbox Live compared to other online gaming services? The mandatory monthly fee just to play.