I was thinking Yanmar was Korean, but it really doesn't matter where they come from. They are among the best small diesel manufacturers in the world. Very good reputation.
I think the jerky 3 point was a compromise that Kubota wasn't willing to spend the extra time and money to correct. They still sell a lot of L series tractors, so the gamble paid off.
My toolbox is steel, 2009 model. You can fit a nice ham sandwich or two in it, but no more than 2 slices of cheese on the sandwich !
Like I said earlier, drive both now before you buy either one. It costs nothing to test drive them, but about $20K to correct a mistaken buy.
The Kubota is one sweet tractor, 3 ph aside. The Deere may have other objectionable traits worse than the 3 ph. I've never operated one, so I don't know. Paper specs are one thing, steel, feel, and ergonomics is another
Sean
Sean