I am about to purchase a Santa Cruz Bronson. I'm 5'10 and 160bls. The size chart on the website for the M is 5'5 to 5'10 and the L 5'10 to 6'1. I'm on the top end of the size chart for an M and the bottom end for the L frame. What would be the next measurement I would look at to determine if I should get the M or L frame? And should I lean towards the M or L?