I've owned an old BSX and currently own a Eminence RN4. The Eminence to me has a more acoustic upright tone. It's passive pickup which, incidentally, can be swapped out for a Fishman Full-Circle (I might do that) is free of the electronic sound of the preamp. Passive just means that you've got to turn the gain or volume pot up a bit more. I bought mine used for $2,000 and the previous owner had the fingerboard completely recarved to emulate a Prescott bass. It works for me.
Sadowsky Blue Label strings
Music Man SR 4, Fender Am St 5 jz
Upton Lami acoustic upright
Georgia Bassist Club #56