FYI, the BX has a full Category 1 3PH, unlike the JD 1-Series that has a Limited Cat 1 due to having less lift height. So whatever you thought you were perceiving about the BX being lower is actually opposite of reality. Maybe the seat height is higher on the 1-Series, but that does not affect the 3PH specs.
On the subject of size, I should have also mentioned that the axle weight ratings of the BX is significantly higher than the JD 1-Series. You have to bump up to the 2-Series (2025R) small-frame CUT to get comparable axle ratings to a BX SCUT.
As a general observation, I think you are putting too much emphasis on size/appearances, rather than the actual specs and capabilities. Yes, the JD 1-Series looks larger than the BX. It has a physically larger footprint and sits higher (although it doesn't have more ground clearance.)
But the objective of a SCUT design is to create a very capable, multi-purpose machine in a small package. The engineering involved for putting all these capabilities into the compact package is actually much trickier than doing it in a larger package (which is a primary reason why there is minimal price difference between SCUTs and small-frame CUTs). In their BX, Kubota manages more ground clearance, more axle capacity, and full Cat 1 3PH in a more compact footprint machine.
Don't get me wrong. JD makes great stuff and their X7 Series is a good example of some impressive engineering - - they offer amazing capabilities in an impressively compact package. But to prove my point above, their 1-Series costs about the same when similarly equipped. That's because it is tricky and expensive to design so many capabilities into such a small package and still have it work well.
For many SCUT buyers, compact footprint coupled with capability is a preferred arrangement to something that simply looks bigger. Those who prefer a larger-looking tractor should probably study the small-frame CUTs instead.
SOLD: 1966 JD 110 Round Fender
Integral Sleeve Hitch, Model 42 Blade,
1972 JD 140 H3
, 1972 Cozy Cab Model 14 JDX (2nd Ed.)
, Front-, Mid-, and Rear-PTOs, Model 54/48" 4-Way Blade, Model 48 MMM, 542 Front PTO, 3-Point-Hitch, Heavy-Hitch, a bunch of Model 80 Carts, MTF Dec. 2013 Machine of the Month