This year durability on 15 Pro and Pro Max back glass seems to be less compared to last year. that back glass can withstand minor drops and hits it seems. We have to use proper case in order to protect from damages or glass shattering when accidents happen.
People going for Pro model sometime goes with Applecare+ too. for 2 years complete protection and cheaper replacement of back, front and entire iPhone as well.
You may go with 15 pro max for its lesser weight, titanium frame and 5X Optical zoom features sis. Shouldnt be a problem. just handle it with care as we always do. and proper case with tempered glass will help.