I do agree that different loading manuals vary considerably. Which gun was the B&D fired out of in the Hodgdon manual?
I am not disagreeing that the performance is nearly on par, and may vary barrel to barrel. Also, I have read about 357 Max Factory cut chambers not being throated properly, but have no experience with the 357 Max Barrels. So it would seem to do either, the best start would be a 357 Mag Barrel. I prefer the 14" in a Contender, if you are going hunting and looking for max performance, why use a ten, though the extra 4" doesn't gain as much as you would think!
The only other consideration is brass. the 357 B&D is custom, but easily formed from 44 Mag I understand (I would use virgin brass, I don't like forming fired brass, tends to split and I don't fool with annealing). The 357 max is readily available, at least for the present.
Either would be a good choice.
I got my 357 AMP barrel because I found it used.