Bruce,
I have opted for the ability to see the lurker next to the door. You can still see the lane edge line even if it isn't very far to the rear. The left convex can be adjusted to give a little better view to the rear but I tend to adjust it for close in viewing also. How scary is it when you try to give yourself a little room for a right turn and some bozo or bozoess tries to zip by on the inside? immediately followed by