We hooked up Wides, Heights and Surround Back to my Denon 3312 and found we like Heights (kg3) much better than either of the other; but, my den has tall vaulted ceilings.
Heights also allow you to use either Audyssey-DSX (A-DSX) or Dolby Pro Logic IIz (PLIIz). Which of those 2 sounds better varies by material.
I use an old AVR, digital, but not HDMI for Surround Back, Simulated Wides (Surround Feed) and 2 more Centers (Phantom).
Next week, we're going to hook up the Denon 3311 in the Parlor with 11.1, but, we think, because of small room size and 8 foot ceilings, Surround Back will probably sound best.