Because that 4wd tractor is easier to drive and doesn’t get stuck so easily, a skid steer is too small and heavy for this purpose. To be honest, I cannot see any good reason why anyone would use a skid steer. Whenever I see them, they look weird. I can’t understand why someone would use them instead of a normal tractor; even in a city where size matters, I don’t see any sense in using this thing. You can ask
machinerydealer.co.uk, and maybe they will tell you a good reason to use it in construction works. But in the woods – no, it's too risky and not worth the little advantage in versatility it offers.