PS4 gets my Vote.
Yeah Xbox has Forza.... but you have a M3... get out and drive!!
PS4 to me is a better system, games that interest me more and I prefer the controller to the xbox controller.
But I have owned each model of the PlayStation since they came out.. so may be a bit biased.
Just ordered a PS4 Uncharted bundle actually but in doing so had to buy my wife a Wii U Mario 8 bundle.. she loves Mario kart... lol. at 299 each I thought it was a good time to pull the trigger.
Good luck In your decision.