To elaborate alittle more on the differences, there has been many complaints on the abrupt stop when operating the BX24 in reverse. There is a long thread here in this forum detailing it. The vast majority that participated in it considers it a flaw w/the BX24 where as a few indicated that it didn't bother them enough to be concerned with it. It should be noted that like it's predecessors (the BX22 and BX23), the BX25 doesn't exhibit any abrupt or jerkyness when stopping in reverse.
The BX24 was designed w/a composite rear fender and hood and the 1st production run of the BX24 saw the rear fender area crack where it bolted to the metal floor pan. Kubota released an upgrade for exisitng units and made a production line change to the rear fenders in a redesign and the installation of steel frame bracing under the fender and this corrected the cracking problem. Theres been no reported problems w/the hood.
Many manufacturers went w/composites in their tractors body's but Kubota decided to go back to a metal fender and hood on the BX25, like it's predesessors the BX22 & BX23.
Additional production changes included a new dash/gauge unit, a new tighter fitting screen cowling and tighter fitting rubber pads on the operating levers/handles.
Other than the reported abrupt stop in reverse, Kubota made production changes and corrected all the other issues that arose on the reengineered BX24/BX2350 units.
The only negative I've seen related to the BX25 is Kubota making the 3ph assembly an option. A $150 - $300 option......
Installation of the 3ph is similar between the BX24 and BX25 and once you've done it a couple times it doesn't take much effort at all.
If theres a huge price difference between the BX24 & BX25 and you can live with the reverse stop, the BX24 should work out very well for you but if the prices are close and/or you don't like the stopping of the BX24, the BX25 will make a very nice tool to add to your arsenal