Hello dear, I would say D&C although MaiTai will do the samething too.
D&C is made with stiffer material (still looks really nice IMO) and the edges will not flip over when pockets are fully loaded with small items. MaiTai on the other hand due to its softer material, you may need to plan ahead of time of what items to put inside the side pockets and leave larger items in the middle compartment to avoid edges flip over. If you are light packer like me, D&C might be a better solution. I also recommend to stuff MaiTai with tissues or airbags while the bag is not in action...Your B or K will be safe with both inserts inside while in storage.
BTW, D&C B30 insert is approx 3 oz heavier than MaiTai B30 insert, what I did to help reduce and lighten the weight of my bags is 1) downsize my wallet to either a Chanel card case or Hermes Calvi. 2) I don't use cosmetic bag instead I use those pockets to store a lipstick, keys...little things like that.
Beautiful lady MaiTai inside my red K32 in clemence:
Playful girl D&C inside my red K32 in clemence: