I own neither yet but I have to say I am on Sony's side as they have done everything a gamer wants, plus Killzone is the tits.
IMO PS4 = Better console, games look much better yada yada Xbox One = Better features (yes yes i know a lot of that shiiit needs fixing)! I got both consoles and to be honest i had no issues with X1, actually i been having more issues with Ps4! Specially games freezing .. NFS Rivals was the worst and sometimes AC4 just freezes or my dude falls down the map .. Spoiler At the end of the day i love both consoles and enjoy playing different games on each system! /rant