[mojomike]

I have no first hand experience in the sense of having owned those subs, but I've a good grasp on the differences between the two.

Generally, the advantage will always fall toward the pair of singles due to the added flexibility in placement and the naturally deeper tuning of the singles. Thay can play deeper and you have the option of stacking them, placing them side-by-side, or separting them to even out the room response.