When we were looking, once we decided on Kubota, we were comparing the BX25, B2920, and B7800. All were about the same price, but the BX25 included the BH. The choice to go to the B was driven more by the rougher condition of the other property for which I wanted more ground clearance and the more capability. The other things I liked about the B was the 3 speed hst, the real tach, the fact that the HP comes from a bigger engine, not more RPM and in general, I just liked its size and feel better. With that said, there certainly seems to be a lot of happy BX owners out there.
As far as knowing more than most of the sales people, unfortunately that is not a very high hurdle.
All of the same reasons I went with the B series. I could have got the BX with the TLB a lot cheaper, but it did not suit me.
WB