Softbums & sized diapers?

frogkisser

DH & I both agree that we prefer the fit of sized diapers on our LOs (at least as of right now), but I've been thinking about trying a couple of Softbums.  How did they fit your LO when they were on the smaller side?  How are they in terms of bulkiness?  Also, can anyone tell me the difference between the Echo and the Omni?  My LOs are about 10.5 lbs and 12 lbs if that helps.

Our stash is primarily perfect fit FB, and Swaddlebees Simplex.  What are your favorite sized diapers and where do you buy them?