A few variables come to mind, however the main influence for me is to try for the best trajectory and consequently,
a double lung shot when the deer passes through your shooting lane. The higher you are, the better your chances
are of carrying your scent over the deer, but you may risk an undesirable angle through the deer,
ultimately leaving yourself with a difficult find.

Most of my set-ups are between 16-20' high, depending on the terrain, the tree selected and deer trail distance I will be shooting too,
which of course is ideally 15-25 yards.