I like the horizontal split type if for no other reason than if the scope has to come off it can go back on usually with little or no change in zero. Verticle splits pretty much require a full re-zero. Conetrols I believe the same.
Ocassions to remove scopes are when you need to confirm a scope or a rifle as having any issues. A known good component lets you verify the other half.

precision is group shooting, accuracy is hitting your intended target.