System Longevity
Sony support their consoles to a great length. Even the Vita, which has struggled in its market to put it politely, is still getting consistent support. They don't suddenly ditch their consoles when making the transition to next gen like some companies are known too, and even in it's seventh year, the PS3 is still getting terrific looking games.
First-party Studios
I like weird games, and I like variety. With this in mind, I feel Sony cater to my tastes the most, as they splash out cash on risky and offbeat projects more than any other publisher. They don't rely solely on a singular franchise, so I can't accuse them of constantly milking an IP (which is something I personally cannot stand), but rather there's a breadth to their catalogue of releases. We're not really seeing that so much at the start of the PS4's life cycle as we are the end of the PS3s, at least not with the bigger titles, but it'll happen. They're willing to fund and put a hefty budget behind unconventional ventures like Quantic Dream's interactive dramas, Team ICO's minimalist approach to story-driven gaming and MediaMolecule's eccentric brand of platformers, and I'm greatly appreciative for it.
Oh, and they've got Naughty Dog - the greatest video game developer there is.
PS4 Exclusives
inFamous: Second Son, Rime, Killzone: Shadow Fall and The Order: 1886 are all games I really want to play.
The Dual Shock 4
My hands will rest on that thing as snug as a bug on a rug. Look at it, it's perfection in the form of a controller.
The Hardware
It's the most powerful next-gen console, at an affordable price, and there're no tacky, unwanted add-ons you're forced to shell out extra cash for.
The Message
They haven't put a foot wrong. Like House said at Gamescom, Sony have been consistent in presenting their message towards consumers. The most anti-consumer policy they've enforced is that multiplayer is now behind a paywall, but seeing as how I have PS+ already and its a brilliant service, that's not much of an issue at all. Everything else has stayed the same or is being made better.
Remote Play
I'm honestly not too interested in this, but I have a Vita so... it's a bonus I guess!
History
If the past has taught me anything, it's that the Playstation is generally the way to go. Loved Sega, but obviously they aren't in the hardware race anymore. Microsoft started well, but they didn't deliver with the 360 in my opinion, and they've totally lost any good will I had for them with the Xbone fiasco, and Nintendo... well, they just haven't done anything for me in years. They're far too safe and conservative these days, both with firsty-party output and cheap, underpowered hardware. Sony have been consistent though. Out of the big three, the PS3 is the best console I've owned this gen, easily, and the PS1 remains my favourite console of all time. PS2 was outshone by the Dreamcast imo, but hey, 2 out of 3 ain't bad. Based purely on preferences built from years of playing games and buying consoles, I know which company my best bet is when it comes to delivering the gaming goods.