Heres a general view of the two Sib hull types you are considering: alu-floor boats have shallow v, flattening out at the transom. This causes the boat to slide a little in the turns and ride more on the tubes, so they tend to bump over the top of the chop. Air-floors have slightly deeper entry v that continues to the transom, so better grip in the turns but they tend to flex a bit over the chop, especially if you have weight fore and aft. So, as said before, both will show weak points in the chop, but the plus points and enjoyment you get will totally outweigh any negatives. If you get the chance, visit a Honwave dealer to compare the 380 air floor against the 400 alu floor.
Happy when wet!