BCA- easier to deal with...
I ended up getting a Float 32 and really like it. Plus, you can buy a paintball to scuba air fill adaptor and get the air cartridge filled pretty easily at local fire depts or places that deal with paintball compressed air cartridges.
I like the fit of my 32- I have a fairly long torso. Shovel/tool compartment is a little on the small side, but the pack is streamlined and relatively light for an airbag pack.