The noise between my bow at 63 and 72.5 is pretty much the same. My Ally is as quiet as my buddies 60 lb Matthews. I will turn it down5lbsbefore season starts if I can't draw it back sitting in a chair and drawing at an odd angle. Once at full draw it is only 17 lbs. So, I can hold it allday.

And the heavier draw weight will hold the KE, momentum, etc longer than the lower poundage bow. Which means if for some reason you do not hit the animal square you have a better chance of a good shot through vitals. At with that a heavier arrow and you have even more KE & momentum.

You can find higher spined arrows with the same weight as the lower spined arrows. So, that's a mute point.