I went into a Deere Dealer years before I was serious about getting a Tractor.
They treated me like crap.
I asked 100s of operators what Tractor to buy.
Everyone of them said JD and then asked me what I wanted in a Tractor and like it was a script everyone on them told me Kubota.
When I got serious I went to one place and they treated me like a King and still do when ever I call to ask them questions.
Kubota makes everything them selves from the chassis's to the Engines. As far as I know everyone else has others build parts for their tractors when it comes to small tractors.
I purchased an MX5800 and I am Very Very satisfied with it.
It has surprised me several times in what it has done for me.
I like my MX5800 so much that when it came time to get a UTV I went back to Kubota and purchased an RTV-X100C. It is a snail going up steep hills but it is a real work horse for me and I really do not need the speed. I need it to work.
I will admit I have absolutely no personal experience with any other tractors so my opinion my be a bit slanted.