I used all pockets from birth all bar 2 swaddlebees OV NB as they are just so darn cute, and a few 40cm bamboo squares! We are now using a mixture of pockets and fitted but that's because I seem to have become pretty addicted to bamboo velour
I never had a problem with containment using pockets, but Summer was only BF for the first week, I had 1 S WN SS pocket, 1 S BBSS, 2 BBOS, 4 XS fuzzis, 4 S fuzzis, 6 bumgenius, 5 bamboo squares, and 2 NB swaddlebees OV, and 2 nature babies wraps! And that was plenty (not that I as satisfied) so that's 25 and we got by fine, and 2 parters were hardly ever used!
Soundlike you have a good selection, I loved my XS fuzzis when Summer was teeny, infact I still do now, they are the only nappies that she can reach the floor in her walker in! I didn't really like the small fuzzis, though if I still had the, I might like them now! The BG are great, ultra reliable, and are used as night nappies when wool is being washed! I hated the fit of the blueberry onesize on her as shes teeny and they are just so bulky, but on the other hand the side snaps I love, very trim, and she still fits in the smalls now! I loved the bamboo squares for bulking out the collection cheaply! Wasnt overly impressed with the NB swaddlebees, I just didn't find them absorbent enough, this totally isn't the case with the side snaps and OS, they are great!
Sorry for the essay, I hope some of it helps!!