I had a 1999 Polaris Sportsman 500 that had 13,000 miles on it and about 1600 hours when I sold it. Carbureted, no problems starting and running. A comfortable ride with good suspension. I currently have a 2005 Bombardier Traxter Max 2 up with about 11,000 miles on it. A not too powerful cold starter and suspension is solid in back so a stiffer ride. The long wheel base offsets that some. I like it for training my dogs but would not choose it for back country use ice fishing. I have a 2003 Honda Rincon with 16,000 miles on it. Great suspension, great starter. The type of transmission it has requires a several minute warmup to function properly. It needs a carburetor kit now but has been and easy starter. I have a 2006 Honda Rubicon with 8,000 miles on it. A great starter and dependable in every way but poor suspension makes for a bumpy, uncomfortable ride. We use our machines to train sled dogs in the early season and even now with only about 3 inches of snow here in the UP where I am at. Today I ran a team 23 miles and took the rest of the day off to watch the Vikings. (Now watching Green Bay vs. Detroit.) These were all carbureted and no real problems other than the rebuild due on the Honda Rincon
I would recommend any machine with good suspension. Lots of low mileage, good machines out there too.
Saying all of that my own opinion is that a snowmachine is easier on the back when it has good suspension. I know that my ATV’s get stuck in lots of snow, especially when towing something. If you plan on getting off plowed roads an ATV will limit you severely. If you go where the plows go you will be fine. By the way, don’t buy your used ATV from a dog musher. Too many miles and the could be speckled with dog [censored]. That is not a unique camo pattern.