Ps4- Great 3rd Party support and great sales
XOne- Halo!
Vita- Lots of Japanese games (you'll be mine soon)!

PS4: Infamous looks fun, and the system is bound to have some awesome JRPGs eventually.
XBO: Project Spark looks like it has a lot of potential.
Vita: Has a ton of niche games that I'd like to try, and a lot of interesting exclusives like Gravity Rush.
Ouya: It's an amazing emulator. Got to try so many old RPGs on it when my apartment mate had one.
NVidia Shield: It's...got...an exclusive...I think...and it's higher tech than the Ouya...

PS4: Looks like an eraser, a useful tool in some real life situations.
XBO: Doesn't look like an eraser, which isn't a very good design choice.
PSVita: Has a funny name.

Is that good enough?

The Sega Genesis, Sega CD add on, Sega Saturn, and Sega Dreamcast are awesome.  So is the Turbo Graphx 16 and it's CD add on.   I don't own any of these.

XBO: The voice features are cool and I enjoy FPS
Wii U: Nintendo first party games and indie games are great.

The PS4 looks very elegant and well designed....and the games will arrive....someday (and it will be  one heck of a system !)

XBone: Microsoft is willing to spend money on a variety of big exclusives.

PS4: Because it will have the exclusives I love and 3d party support

WiiU: I'd love to try some exclusives, if not only for curiosity.

3ds: Curious about the 3d and some Jrpgs as well.

Also to add, Im interested in the Japanese exclusives the XBO will have

PS4: It will eventually get The Last Guardian......Eventually!
Xbox One: It will eventually get a good Rare-developed game............Eventually!
PS Vita: It will eventually get must have games..........Eventually! I am not trying to troll the Vita by the way! =)

don't own those consoles for a reason. Zero interest in wii u or xbone. But I do own these:

Original pong system
Vectrex
Mattel intellivision
Atari 2600
Atari 7800
Tandy Trs80
Sega master system
NES
Gameboy original
Gameboy slim(yellow)
Gameboy color (purple)
Sega genesis
Sega cd
Sega 32x
Super Nes
Original PlayStation(w 3 composite ports)
Original PlayStation (with more current composite plug adapter)
N64
Gba original
Gba mod- backlight
Gba s
DREAMCAST!!!!! -Hell yeah!
Ps2 fat
Xbox original soft mod 100 gb hdd w xmbc
Gamecube platinum
Psp fat
Psp 2000
Psp 3000 peace walker custom camo
Dsi coral blue
Dsi black
Ps3 60gb w 500gb hdd
Ps3 80gb w 500gb hdd
Ps3 40gb w 250gb hdd
Ps3 250gb super slim
Xbox 360 4gb w 120gb hdd
Xbox 360 slim w 250gb hdd
Wii red soft-mod w 250gb hdd
PsVita 3g/wifi model 32gb & 8gb cards
Ouya w 2tb ext hdd w ps3 controller
Ps4 500gb hdd
Pc amd phenom black edition w8gb corsair & 7850 - irrelevant now
Asus gaming laptop