The vertical style is more consistent. However, at hunting ranges you would never notice the difference. I've flipped flopped both ways and have settled with about 1:00 cant.

Just play around with different styles.... It took me a year of daily shooting to figure out which style I liked best.... I've settled at an instinctive gap aiming method, 3 fingers under, high anchor point, and a pause at full draw while I check the gap and apply back tension......