I think it depends alot on how you plan on using your machine and your financial situation. We have bought 3 Kubota tractors so far and we couldn't be happier with their function, quality, features, etc...
That being said: we have had a Mule 610 for 5 years now of heavy use. I have overloaded it with heavy logs for firewood hundreds of times, bringing up wood to the house through our hilly woods. Never a single problem with it. Very, very reliable. When we bought it we paid $6,500 plus tax. For the money I don't think you can touch it. It is not a speed demon or my pick to go mud bogging in.
Now if money isn't an issue, sure I'd spring for the Kubota with all of it's features and quality reputation.