Well....I'm in love with my BG sized AIOs. Love, love, LOVE.
I've not had super great experiences with other 'one size' diapers so I am steering clear of them for a while. To be fair, I haven't tried BG's one size diapers. But I much prefer my AIOs to pockets ... the constant stuffing used to drive me n.u.t.s! But maybe I'm just lazy. ;-)
The wonderful thing about the sized AIOs is that you CAN stuff them as well. I add a stay dry insert at night -- I love the versatility of their AIOs.