What VoxHog said; if you want a small knife that you can open crates with or pry open doors, then the "standard" AD is a knife for you. I've read that they're quite popular with Military personnel who want a very tough knife that doesn't fall into the Rambo category.
The BAD is tough for a knife that will be used as a knife, but it is not intended to be used as a chisel or a prybar. Personally, I think they're great, but I'm a city boy. The writeup on the Busse Company Store is:
Here's a new take on the Active Duty. The Boney Active Duty featured here is a super thin slicer and dicer with a full flat grind at 1/8th inch!
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The BAD's are mission specific designed to be wicked slicers!
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We have bumped the hardness on these to 60-62 rc for better wear resistance when cutting softer materials and in order to better support the extra fine point and edge.
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These by far are the thinnest ground EDC blades to ever leave the Busse Shop. The edge of the primary bevel is ground down to .012 - .015 prior to sharpening and the distal taper extends nearly the full length of the cutting edge!
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The tips are VERY fine and are not designed for prying or heavy abuse... No worries though. If you find yourself in a precarious situation and need to abuse your BAD, you are still covered by our warranty..
If you're considering a BAD, you might also look for a Scrap Yard Mud Puppy LE (if you can find one). It's got a similar blade shape (in 154CM stainless) and a super comfy mudder Res-C handle.