as a (buy um all) person, who plays my FPS on the PC (disclosure) I have prefered the Sony consoles as they seem to have the Best mix of games. If I enjoyed FPS on consoles the 360 would have been my choice (I do NOT like halo, but quite simply IN the US LIVE has the best game matching, if you can get by the constant potty talk). Last gen in the US the 360 was the better choice because of LIVE if you did online gaming. One thing to consider this time is numbers.. much like in the US last gen, the 360 had the player base, better match making because of it. But this gen (so far) the PS4 is outselling the Bone pretty much 2:1 so if that holds true, the PS4 will have the better match making this gen. Purely based on Multiplayer games. Sad thing is I was really looking at the BONE for the game playing/tv watching stuff. But seeing more and more games playing faster on the PS4 is really swaying me. Last gen there was difference, but this gen its way more pronounced. taking a few shaders out to speed it up was bad ( last gen, and the PS3), but lowering the rez by a 3rd.. ouch.. (i do play on a big screen, and not FPS so i notice it).. again if its FPS, eh.. the action is fast, most wont notice it.
most mention the games you want to play, couldn't agree more, but as owning both, you get all games so you pick the one that better in other ways. I would go PS4, more units, more players, more exclusives down the road(if that trend holds). MS has deeper pockets, so if they cant win the sales war they may buy a few exclusives and even the field (worth a thought also). Sony is the more powerful now that they are on more even terms developer wise, when Sony slowly caught up last gen, as they had the power but nobody could use it, this gen they program almost the same (tech geeks, please note, "almost" is relative to how different they where last gen) so speed differences, you find a way to tweek one, the other should arguably have the same ability.. hence the PS4 should retain its horsepower crown this gen, but anything could happen, so its not guaranteed. all the above is just opinion.
games , features, take the one that appeals.. right now I feel i have 2 worthless consoles. There isn't a game out that makes um worth a purchase at all right now (again, just an opinion).