Rzr is much better than the rhino in the mud. If space is an issue with your tow vehicle go with the rzr.
I own a rzr and a friend has/had a rhino. We used the rhino out on the trails all the time. Although now that same friend owns a Rzr and he is selling the rhino
Really depends on what you want to do with it. For my situation I had to get two sport quads and a sxs in my raptor with a 8 1/2 x 12 garage. The Rzr meets that criteria. Also we do a lot of trail riding and with the wife and an 8 year old daughter the Rzr met the criteria again. We will not even go into the which is faster, smoother etc. The Rzr is a great investment.