stihl only
ArboristSite Operative
If you got the money for new or used in good shape go Kubota. They are great tractors and the small one are strong for their size. Everyone around here who has one can't say enough about how good they are. You could also look into the German bulit John Deere tractors(stay away from the cheaper ones).
That's a pretty blanket statement. Would be like saying that a Stihl is the only saw to buy.
Kubota is good, but there are a lot of other choices out there that aren't Kubota. Some may actually be built better and priced cheaper because the Kubota tractors tend to have a lot of resale value.
There are brands other than JD, Kubota, and NH that offer a ton of value with their tractors because it's the only way they can stay in business. They have to be cheaper, and in many cases they offer better product because they don't have a name to carry them.