I am the odd-ball here, I have had decent luck with Polaris. I currently own a 2017 Sportsman 850SP. It’s been a great machine so far, I have roughly 500 miles on it and it is literally like riding a couch (it has decent power as well!). I also had a 2014 Sportsman 570 with 500 miles on it with no issues (just sold it as it’s no longer being used). My last 2005 Sportsman 500 was a decent machine, but I did have to replace the starter in that one a couple years ago and did have to do the rear CV/axles.
In our neighborhood we have at least 4-5 other newer 2016+ Polaris wheelers and have not had any issues with them (both 570s’s and 850’s).
With that said, I would certainly look at the Can-Am’s (we have a few of those in the neighborhood as well). They are nice, but they charge a premium for them. One of my neighbors just had a cracked/split rim on his brand new can-am 1000 side by side last weekend up at mud nationals, and was only going through mud. It appears like the other rims may be started to have similar issues. So, any machines can have issue.
If your buying a new machine, GET EPS! I would never consider another machine without it.
We go on multiple rides per year with our neighbors and have not had any major issues, aside from an older Arctic Cat machine.