I used to own a Rhino and my only complaint was that the unit is way underpowered so I decided to upgrade. I've now got a Can Am Commander as well and I like the machine but there are a few complaints that I was blindsided by because I didn't see it when I was doing my simple research. They are noisy as hell. I have a 2012 and even with the newest rear end they still make a ton of noise and everything says the 2013 are no different. Far worse than the Rhino. The clutch and gears will give you a clunk and high pitched whine that some people can't stand. I do not run tracks so I can't comment on that.
One of my biggest complaints about the Can Am is the after market parts options. This isn't a knock on the machine in anyway, it's just they aren't that popular compared to the Rhino so less people make after market stuff for them. Where you might be able to find a bunch of different soft full enclosures for the Rhino, you will have 1 or 2 only available for the Can Am. My doors on my Can Am are dang nice but at the time there was only 1 soft full enclosure available and it was junk so I had to compromise. So now I have doors but will need to custom fab the top section of the doors to get it fully enclosed. The newest soft cab out looks promising but it doesn't appear to work if you put a hard roof on the machine. The hard full cabs are 3-5k depending on brand and were never even an option for me.
The machine rides great, the seats are comfy, and has plenty of power to get around. Belts are not easily changed. If you blow a belt it could take a while to change it. I don't know if the other machines with dry belts take as long but there's a ton of small plastic clips holding the plastic molding and interior together, and then the location of the bolts covering the clutch casing.
It might sound like I am saying there's a lot of bad things about the machine but really there isn't. No machine is going to be perfect all around. You just have to pick what you can live with or without and go from there. If I were to buy again, I could live with the items that I mentioned, some people probably couldn't.