If you want the actual best. The base needs to be machined to properly fit the rifle. Optically centered at any distance you choose. An example: .0003 inches of misalignment per inch of base length is a little over 1 inch at 100 yds. If you were to zero at 100 yds. then at 500 yds. your Horizontal will be more than 4 inches off! My conclusion is that the fit matters more than the Brand ( when we are talking about the comparison of good parts)