ORIGINAL: BowyerNADE
I shoot a Trophy Ridge Flatliner 3 pin (vertical pins) and i feel vertical pins do have a much clearer sight window than horizontal arrangements but i would have to say go to nearest proshop and ask to try bows with both vertical and horizontal pins and see what you like best. here is what to expect.
How do you gap/split your pins? It's impossible unless you have your pins off to the side which is not good especially when picking a hair or another nock on a 3D range. Seems odd to have vertical alignment?