RE: Dual Dove tail or Standard setup?
I prefer the dovetail in the front and the windage base in the rear. Just in case the rings do not align properly the windage adjustments can come in real handy. They also help with bore sighting as long as you move them very very slightly so that you do not bend the scope.
With the dual dove tail and Weaver style there is no adjustment that can be made to align the rings other than shimming.