I've tried both as well.
TDW lists a bunch on the paysite pages and prior to the new template I listed 10 on a page above the free-site listings.
Depraved Pornsites only lists 2 sponsor sites on a category page and those links rotate, but I doubt any of my categories have more than 10 actual sites that it can rotate between and some have only 3.
As far as results...I have no idea. I don't really see any big difference.
