I ride my fat bike year round, often moving my full suspension Giant Anthem X 29 aside to get to it.
It's a Framed Minnesota 3.0 w/ the Bluto forks but hard tail. I added a suspension seat post for additional comfort but it goes on some serious single track trails and snow covered but groomed trails with ease.
My advice would be fat (4x26) or plus (3x27.5) hard tail IF.... if you are only single track trails (you never said what or how you ride.