I say Adam first. The product page has the Adam at 5 1/4" around, which is slightly smaller than the Cush's 5 1/2".
Speaking from personal experience, I own the Cush and my eyes were waay bigger than my vagina. It's head is quite cushy (
), but its shaft is so thick that the outer layer seems miniscule given the girth of the firmer core that supports it. I assume the Adam is similar to my Mark, which has a thicker squishy layer. That being said, if you're just going for that deliciously full feeling with a side of dual-density silicone, I bet the Cush delivers!