i have used HH one size, and the sized ones as well as FB sized.
I loved the FB sized, they do fit big (someone recently gave us a large and i don't know that if i bought it i would ever need to go past medium with dd)
it was a long time before the HH sized ones fit dd, i didn't like them, they always leaked out the side. however, they were hand me downs and an older style that has been fixed, i think.
that being said, our absolute hands down favorites are the HH one size. i'd really spend the money on those again if i had the chance. they've held up beautifully (as opposed to our very ratty BG's) and the fit is very adjustable and nice.