I just got some itti bitti nappies and looove them, really trim and absorbant! I found the elastic in the legs of the bumgenius went, although I think I have the version 2, I have heard they fixed this problem with the version 3.
Both of my girls rashed really bad from fleece pocket diapers, so I personally LOVE Green Mountain Diaper Company's unbleached cotton prefolds fastened with a Snappi, and with a mix of covers (namely Thirsties and Bummis), though wool would be my number 1 choice. They wash so clean compared to the thick fleece inserts, so we had less odor and staining, and best of all, no rashes. I have to say I also appreciate the low price and natural aspect of cotton.
I bought a bunch of AOI's and some pockets. I would say to go snaps when possible. Velcro wears out. Although, my favorite ones so far are the grobaby's and they are velcro, but it's a unique type of velcro that seems will never lose it's stickiness. I think they fit the cutest too. I really love the bumgenius organic cotton snap one size diapers. I also like the Haute pocket diapers for night time. Although, I think the liners on the more synthetic options hold in the stink way more than the organic.
We are using Bumgenius 3.0 and knickernappies onesize and I like them both, but the easiest to use and best fit are the BG 3.0. I started my daughter on G diapers but found them much too difficult and not economical so I went with disposables for awhile, since switching her to all pockets she is much happier and I never have any leaks anymore. On the rare occasion that we use a paper diaper it always leaks.