Xbox one or ps4. They are remaking a lot of the big last gen games. Also games will slowly start going 8th gen only. So while you won't miss out on much this year if you get a 360/ps3, You certainly will starting next year.
As to how to decide which console to get.
Get a ps4 if
you have a nice gaming PC since a lot of xb1 games are xb1/PC.
like the ps4 announced/released exclusives better.
want the best graphics possible on consoles.
want to save some money since it sounds like you want to get the kinect xb1.
Get a xbox one if
you want to play multiplayer with your friends since you mentioned they all play on the xb1.
like the xbox one announced/released exclusives better.
Being able to playing around with kinect is more important than the better graphics.
I would probably go with the xbox one if I was in your situation assuming you don't have a gaming PC. Both consoles will have plenty of games to entertain you with. And to me at least, being able to play with friends is very important. On the other hand if you aren't big on multiplayer than the ps4 would be the better choice.
