I got a sample as well. I like the Underjams because they are more like baby diapers than Goodnites. The unfortunate thing however is the sides and their tendency to rip. At the moment Goodnites are still a little bit bigger, and have a much smaller tendency to rip compared to Underjams, or at least in my experience.
Also, when i tried an Underjam, it leaked for me faster than a Goodnite did, but seeing as they are intended for a smaller person than Goodnites, I can understand the leakage.
Overall I do like them, equally as much as Goodnites, for different reasons.
Underjams: More babyish, (i think they are thicker, and more comfy)
Goodnites: Hold more, bigger, sides do not rip like Underjams do.
I would go for both, in my opinion
