Turf tyres are ideal for me as I use the tractor on my mini golf course(no severe marks on the surface). The 4WD comes in handy when going up the steep hill I have or else I'll use the diff lock, though diff lock is inclined to tare the ground when I turn. One great advantage of 4WD apart from climbing is the control you have coming down a steep slope.
Thank god for 4WD, ...or whoever invented it.