I think that the mobile home would have the lowest maintenance cost. But it all depends. You didn't give the information on where do the housing options take place so the cost may vary.
A mobile home is preconstructed structure, that can be run and transported to other location according to the choice of living place. This can be prepared from wood or other kind of cheap material which can keep the weight of mobile home low.
Thus mobile home is the lowest maintainace cost home for a single family.
