There seems to be no relevant difference in popularity between WSM and SAUM in the poll, so why is SAUM brass so uncommon with the manufacturers?
I voted SAUM because I am having one built right now, but I have been waiting for 6 months for PT&G to supply the reamer!
I wander if that would be the case with the WSM.
Those issues aside, I think any of the 3 choices in the poll are on par for all practical reasons and You would be splitting hairs to argue otherwise.
I also think people tend to get too bogged down with decisions (me included) when they should just get out there and start pulling triggers