Which one is "better" is highly subjective. It all comes down to what you're looking for. Personally, I'm not after an all-in-one entertainment box or an online focused device. I just want to play good games, online and offline. As long as PSN allows me to connect and talk to my buddies I'll be a happy bunny.
I think it is to early to decide which console I will buy but as far as I know the specs are almost the same. However Sony named a few nice titles for the PS4 and Xbox only named Call of Duty...