I have a Bushhog loader on my B8200. It works great. But, when I added the loader, the original loader was not available any more(Tractor series was built '85,'86 B7200/b8200/b9200, and was foirerunner to B2150 and later B2710). to use a Kubota loader, the frame would have required modification. The Bushhog was a bolt-on.
If I were getting a new or near new tractor, I would get the factory loader, even though I have been more than happy with the after market unit.