Couple thoughts.
The BX Kubota has a very small 3ph. Is the JD 3PH larger? If so, that would be a major plus in my opinion.
I would also lay on the ground and look up and see what is there to be damaged by a stick or rock worst case. I know the BX has a plastic fan that is easily damaged if the right stick comes along.
Consider ground clearance too. The BX really is not as bad as the specs say, at something just over 6 inches, because that is at the axles. There is more clearance under the rest of the tractor...but still not as much as a slightly larger tractor has.
Finally, consider one step larger in tractor size in both colors (and blue too if around). You get more per dollar if you go larger. One step up might give you a standard size 3PH, more ground clearance and a little more loader capacity, among other things. At not a great increase in price.
Enjoy the decision process. When I was there a couple years ago I decided on one size tractor (after a lot of overthink) and at the last minute went one size larger and believe that is the best thing I could have done. Tractors get smaller with use... /forums/images/graemlins/smile.gif