I keep seeing this assertion from Xbox guys that PSN is inferior. I'm telling you guys from experience and owning both consoles that PSN does not have these problems.
PSN was hacked and brought down once for too long. That was dumb of Sony, and they didn't handle the situation well. Not long after when both Sony and Microsoft had upgraded their security as a result, the attempt was made on Xbox Live and caused enough problems over a span of four days that Microsoft also gave out some freebies by way of apology. It was going to hit one of them first - it happened to be Sony.
Network performance is the same, downloads come in at the same speed. I play CoD a lot these days on PSN and I work with a guy who plays it on XBL, and he's asked me a few times if I have to wait through "host migrations" constantly because it seems like he does it every game. I've seen it maybe 4-5 times since I've owned it. These things don't really have anything to do with the network itself, anyway. It's all hearsay and speculative.
I also keep seeing Xbox guys talk about how they're sticking with Microsoft because they're going to have "300,000 servers, take that Sony!" I doubt any of those people know what that actually means, whether or not there is virtualization involved, or how many servers Sony has. There are legitimate reasons to want an Xbox One. Some people really like Kinect, some people are excited about the TV integration features. I don't know why I keep seeing made-up garbage like that tossed around as the reason why Sony SUXORZ.