I understand why some prefer ATVs and some prefer UTVs (side-by-sides). They are really
quite different tools, suited for different jobs.
My ATVs are small 500# machines that get into tight areas and turn around easily. UTVs are
the size and weight of a small car. I use my UTV (with hyd dump) only when I need to haul
dirt or other materials.
I also run a 4x4 ATV and a 2WD ATV. I need 4x4 whenever I pull my trailer or
chipper. The
2WD drives much better and has much smaller turning radius. I also have a rear differential
on the 2WD, which is only offered currently on the Polaris Sportsman Turf quad. Virtually
all quads have locked rear ends, which makes them terrible on pavement. I have a mix of
paved road, and steep dirt terrain.
Most UTV brands now sold offer a rear lockable differential option, which make them usable for
pavement as well as off road.