I think I"m going to buy organic, but I saw this when I checked out the suggestions above. It looks like a good deal!
From what I can tell:
-Kawaii has 2 one size microfiber inserts, FB has 1 large microfiber insert and 1 newborn microfiber insert (guessing you would use both if needed)
-Kawaii has 3 rows of snaps to adjust the rise, FB has neat elastic inside that you use to adjust the diaper
-Kawaii has a neat flap to cover the pocket so the microfiber can't touch baby, FB doesn't
And Kawaii is about half the price. It looks to me like a FB would fit a little baby sooner, the Kawaii look big to me, but I could be wrong. Maybe somebody who has actually used theirs can give their preference.