I've had Kubota, Deere, Ford and flirted with IH. Originally, I wanted all Deere but when I had a problem with the draft control on a new 90 HP Deere, the dealer took the tractor in but it was in the exact spot I left it when I came back a couple times. I'm pretty sure they never looked at it. The problem didn't get fixed until I fixed it myself. I realized then that if I ever needed them they wouldn't be there.
So I bought Kubotas from a nice dealer and so far only little issues that they did more than they should to make me happy. I'm slowing down now and selling stuff but Kubota worked for me because the tractors rarely had issues and when they did, the dealer jumped through hoops to keep me happy. They even drove a part out to me on a Saturday despite my saying not to. But, I beat the rain that day.
The dealer makes it all work but the manufacturer has to sell enough tractors to keep the business profitable. You have to buy from a manufacturer that sells a lot of tractors and is able to support a dealer network for service and sale. Smaller brands often can't catch up.