Belt drive may be very problem free. They use them a lot on snowmobiles were cold weather keep them tight and motor noise may cover it up. The Kioti has a belt drive and I looked at it hard.
At the end of the day for southern mud and swamps I like a enclosed Transmission on Kubota and Honda.
The new Honda 500 has a 5 speed inclosed transmission with paddle shifters mounted on steering wheel . Similar to today's higher end cars and trucks. Honda has the advantage of building current new technology because they build across many platforms and are able to spread the costs. I would expect Polaris to follow in 5 or so years.
Honda , Polaris, Kioti and John Deere don't even run in the Kubota Standard for UTVs work machines.