I'd probably get a Honda ATV for the transmission.
If I wanted a UTV I'd probably get the big engined Kawasaki Mule
But yea a tractor would do farm work tilling etc... better than either.
I have an atv, we either need a 2nd atv, or a UTV, which are nice because 2-3 people 1 vehicle and a bed to haul a lot more stuff more easily than an ATV.
ATV's can get into tighter spots than a UTV.