No one has mentioned the downside of the handling character on the 2WD Ural. The sidecar wheel lead is totally different than that of the RWD Ural, this gives, (to my mind) quite unpleasant handling on the vast majority of roads.
Also worth noting is that the 2WD Ural has no differential, so you cannot use the 2WD unless you are on a loose surface, if you do, transmission wind up will see you in the hedge.
I don't own a Ural, so have no vested interest in either.
Honda C90 custom project thing
Suzuki SV650 waiting for a sidecar
XJR1300 with Motopodd sidecar