ML Descent or Sunfire True Sub MkIV?

I have a chance to buy a Martin logan descent at a very good price and currently have a sunfire MkIV. My system consists of cary cinema 11 pre/pro, cary cinema 2 and cinema 5 amps and dynaudio focus 140 L/R and dynaudio focus 200c for center. I unfortunately had to use in ceilings for the rear 4 speakers. Room is 18x 12 x 9 feet. I suspect that the ML would be more musical, but which would be better for HT?
Mark