PS4, though I don't have one yet (I have it on layaway for the, uh...kids...yeah, that's the ticket). Look, I liked the original Xbox. During that generation, I had the GC, PS2, and Xbox, and I loved all 3 for different reasons. The 360 was the first console I had of the last generation. Three different 360s died on me at different intervals and all 3 were worked on until they couldn't be worked on anymore. I have never experienced such a high failure rate in any console I've ever owned (and I've owned a LOT).
That's not to say there weren't good games on the 360 that I wouldn't mind playing again (and never got a chance to play in the first place), but I wouldn't want to see the same problem with the Xbox One (though I haven't heard of any specific RROD failures on that console yet). So that's one reason, sure. The other reason is JRPGs. Even though Xbox has been getting better about acquiring JRPG content (and Japan has opened up a little more on making said content for an American-based console), the fact of the matter is there just aren't as many JRPGs (especially exclusive JRPGs) for the Xbox systems as a whole.
As is, I'm already eager to play Bloodborne and Disgaea 5, but I'm also highly anticipating Persona 5. I don't really see any exclusive titles on the XBO that I really want (though I may consider it if Lost Odyssey is a title I can play with the backwards compatibility). For me, it's not really about the graphics or raw hardware power anymore (especially since my PC is a BEAST), rather it's about what is actually exclusive and will be more fun to play on the console over a PC.