None of them. I was a HOG dealer and never bothered to get one. Get a BPW and be done with it. It'll fit every time because you fit it to you.
Distribute the weight correctly and you'll feel like an F16 in the water instead of a B52.
I have dived an Axiom and it's a decent BCD as far as they go (good stability, comfortable, decent sized pockets). But they do create a noticeable amount of drag compared to a backplate and wing. As others have said, if you're in the market, you'd be better off going that route.
So then what about just getting a back inflated bcd vs the bpw?