To each his own, I'd try them both ways and see which you shoot better with. I prefer them oriented vertically coinciding with my slight cant(1:00 to 7:00), as I'm less prone to pick up anything in my peripheral vision with the possible exception of the ferrule, which isn't much different in perceived length than the long field points I shoot. I happen to believe that most folks are very aware of the end of the arrow in their peripheral site picture, although no truly "instinctive" shooter would ever admit to such blasphemy, lol! I would think horizontal would subconsciously make the arrow look two inches longer. Just my 2 cents!