#1 is useful if you intend to shoot the gun with the butt in the crook of your elbow, otherwise it means nothing.(courtesy of JOC)
LOL!!
#2 sounds closer to me also. But, I can take a gun with a 13 1/2" LOP and get 1" of clearance and take a 15" LOP and get the same clearance if I want. "Stock crawling" is a secondary sport in some circles. A good fit isn't just about measurments and clearances, it's also about proper mounting and conformation.
If you're trying to fit yourself or another, or just want to learn more about the subject, I highly recommend Michael Yardley's book "Gunfitting". It's only about 100 pgs but packed with knowledge.
