My favorite pads use Dupont Coolmax. But those also come in many varieties, and availability seems to change from year to year. The best pads I've worn came with the least expensive shorts and bibs -- Przewalski, which aren't bad at all and have great pads. A bit thicker and more resilient than others, but in actual practice feel quite comfy despite the adult-diaper sort of look.
My preference in pads changed with my weight. When I weighed more and rode more padded saddles, I preferred thinner pads -- Aerotech Pro shorts, Black Bibs, Pearl Izumi. But I've lost weight, have less natural padding on my butt bones, and prefer lighter, less padded saddles. So now I prefer the denser padding of the Coolmax chamois.
As other folks said, you just gotta try 'em and see.