FWIW I'd vote for the
L4610 HST, Low hours, setup with R4's, probably a bit easier to trailer round than the others as well. And its closer to you, seems like the better deal to me if you give up a few HP, and of course if you are comfortable with the HST option.
I've owned a Kubota before, have an old
L175 that just wont die but its hardly a modern Kub by any means, and I have never sat my hiney in a Deere, not even in a dealer lot, nor have I checked out any of the newer Kubota models. They both always seemed to be priced at a premium to the other brands I was comparing them with, but with the choices you presented I would still stick with the
L4610.