Hi , In my view, Bridle Butt is the very best cut, and I doubt anyone would argue, but, at twice the price! I am using Butt because I was not happy with the quality of some of the shoulders I've had over the past few years, The quality of English Bridle shoulder can vary a lot from poor to excellent, but the best shoulder does not compare with the sedgewicks butt, which for my use, is a close to perfect that I have yet found.
The ONLY reason that shoulder would be used rather than butt would be cost / profit, and if someone says simply " Bridle Leather" I would not assume that they have used the butt at double the price. If in doubt ask.
Obviously I pass the extra expense of using bridle butt on to the client, but my time is the greater part of the cost of a case, so my view is that it is a false economy to try and save money by using poorer quality leathers!
Patek, I have asked a couple of clients to get in touch, so have a chat with them, and see what you think. Thanks to everyone for your kind remaks