For most it is the higher the better as you have seen from most posts. For bowhunters, you can get a little too high and create the possibility of a bad shot due to the greater angle down for like 10-15 yard shots. For gun hunters, I'd go higher for scent control, more forgiveness of movement, and safety if lead from others is flying around. For me that is 16-25 feet for bow and 20-40 for gun.

Lefty Llewellyn