Sounds to me like if you got him, and got it mounted, every time you look at the mount you would wonder what the rack would’ve looked like if given another year. If the buck is on private land and you think he has a chance to make it another year, I’d let it walk. If it’s on public and the pressure is heavy, I’d shoot if it is a deer that trips your trigger. Looking through trail cam pics in years past from my property, most nice bucks I get on camera are not there the following season. A few were, and a couple of them grew into real nice bucks. Just know that you have no control over if that particular buck will be in that area next season, even if he does survive.