Wheel size debate aside, which class from the mtb world would you pick to commute on grass, gravel, concrete, and asphalt? Gravity/downhill? XC? One of the other "labels" that I'm not sure of??

I want disc brakes and I'm willing to pay the weight penalty to get them. Also, I'm hoping a mtb will have a bit sturdier of a wheelset (even the entry level ones should, right?) than what I'm currently running- I think my rear wheel is trying to go out of true again , and I've only it back from the shop about 2 weeks...