Several of us have owned both BXs and Bs and done comparison reports between the two models.
I started with a BX as my first tractor and went up to Bs and even an L and now back to a BX.
The BX is a SubCompactUtilityTractor SCUT and the B is a CompactUtilityTractor CUT. The BX is smaller and thus closer to the ground by a few inches which is a problem on really rough ground. The BX hangs tighter or seems to on hillsides.
The price difference isn't that big. The Mid mount mower, front end loader and back hoe add several thousand dollars to their price. I have a
bX25D now which comes with a FEL and BH but no MMM as do the
BX23,
BX24 and
BX25 so their price is higher.
A rear finish mower is cheaper and better (in my opinion) than a MMM.
You can get a new BX or B for under $10000 without FEL and MMM. I wouldn't want one with out FEL and never want another gear drive tractor (HST only for me).
BPflick and I both did a comparison reports here with some great info added from other contributors. Do the search on his and mine to find them. I had a
B3200 and
BX2660 at the same time and did a review on them sitting side by side. BP owned a BX traded to a B and then back to a BX. Maybe someone will find and bump those reviews.