At 6'5" I have come to appreciate that when standing behind an angled scope I can bend at the waist and don't have to squat like Im taking a dump behind a straight scope because 99.9% of the tripods in the world are too short.
At 6'4" I am not that much behind you... but those sessions of squatting like that are not required, usually and the angled scope will always be harder to find the critter in...