Three under puts the arrow closer to the eye and helps many people shoot well with less practice...and some shoot better that way no matter how much they have practiced with other methods that position the arrow nock further from the eye. On the other hand lower anchors/nock positions tend to be easier to use in long range shooting. With a F-glass laminated bow there is little concern abouyt tillering specifically for three under and if you like shooting that way It certainly doesn't bother me. Three under can be hard on selfbows unless the tillering accounts for it. Of course 3 under doesn't work well with loose fitting nocks. For me split is simply "right". I shot 3 under a little bit 25+ years ago. It was easy to hit close range targets but it never felt "right" to me so I switched back to split.