I shoot split (to include my Hill style Vixen). One single nock crimp above arrow. I shoot split mainly because I always have and I feel more in control of the arrow but thats just me. I did try 3 under and while I was consistent with it my shot was always low. Switching to Hill style I shot low at first due to the arrow rest being so close to my hand, but I quickly adapted to that. The 3U thing I did not adapt to. Additionally, 3U was loud to me. I like quiet - my arrow wont outrun an animal ducking it so silence is my best friend. There's merit to the arrow being close to your eye, but it isn't for me.