Please note that using a protractor sets the correct overhang for that alignment.
Do NOT then set overhang with another device. Setting a specified overhang with the cartridge straight in the headshell is just a quick way to get in the ballpark.
A Baerwald alignment will be close to 2 mm longer than a Stevenson alignment, and who knows what alignment some manufacturers use.
I like Baerwald, but Stevenson might be better for those inner grooves of long records, because it uses an inner null point that is closer to the spindle.
Cheers,
Alec