I've never tried GMDs but the Osocozy are just okay. I like Cottonbabies prefolds a lot. I would probably go with trying GMD between the two. People really seem to like them!
I only know GMD and like them. They have tons of life left after diapering two kids. I have some newborn orange 1 doz of which is organic seconds, and I have yellow, brown and green. Yellow and brown are used the longest. I only used the big green edge on my firstborn so far and they are organic and they were VERY hard to prep. It took so many more washes than the white dipes and if I used them on my second, I don't think they would absorb as well as white. But, I didn't have any problem with the organic orange newborn in that regard.
Re: prefold options