It will be a U36B, because I left N scale to get one in HO. You're welcome. 
DFF
No no no, what you were supposed to do is painstakingly kitbash one in N scale, become dissatisfied with it, then switch to HO...That
might have gotten one produced for Nscale.
Not to rain on anyones parade, but the U33B had only 4 "original" buyers, and the U36B had only 3 . The U30B, OTOH, was sold to 11 "original" buyers. And of course this does not take into account secondhand owners for any of the above, but from a numbers standpoint the U30B has the most options for sales, whereas the U36B was basically a SBD only locomotive, save for a few sold to Autotrain and CR...