Just curious which would be "better"

(2) SVS PC12-NSB (approx $1050)
or
(1) PC12-PLUS (approx $1000)


Current system:
Paradigm Reference Studio 100s V2 (& their CC Center and polk audio surround)
Onkyo TX-797 Receiver
Behring BFD (waiting for a sub....)
Room 11x14x7.5
Music 50% HT 50%

I like to walk around and pace and lol.... so with my current single sub (Polk Audio PSW110) I hear BIG variances when i walk around, something my Behringer BFD can not fix since it varies by location.

Would (2) of the NSBs in opposing sides of the 14ft wall (flaking my Paradigms) sound better then a single PLUS?

I have a primary position, but I like to move around.