Front would take up less space but could be used in any position.
I carry a UTV Hi-Lift jack but use it more for vehicle recovery than a tire changing tool. Hi-Lift can be used as a winch, lift rig outta hole and can be driven in ground for a winch anchor. As far as changing a flat you can drive up on a berm, over a ditch, on a rock, on a stump or onto about any other unlevel surface and lift a tire off the ground.