Why a Back-Inflate BC Instead of BP/W

[onemorefalcon]

Scuba toys has it for $235.

 

[runway1]

Scuba toys has it for $235.

That's the "razor" wing. I bought the "signature" series for $250 at addhelium.com but it's been raised to $265 now. Currently, scubatoys has the signature series for $296.

What's the diff? The signature series has much tougher exterior with a seperate bladder. The razor has a perfectly adequate exterior and is bladder-less.