I haven't tried either of those, but just got some samples from Marshall's Cove Paints (http://www.marshallscovemarinepaint.com/), and looking forward to trying them when I get back from San Diego... They've got some good colors, too...
Dan, I just got a sample too, seems this is how to win new customers, which is uncommon nowadays eh! Trying on some sample surfaces but so far it seems to go on nicely. Have you tried fooling with it yet?
Painted the side of a paint thinner can with primer spayed on it. I used a throw away bristle brush and paint with no additive, leveled out beautifully. Not convinced though until I try it on the real thing, seems really nice though.