I snap onto a targer better-faster with an o/u! I like the classic SXS, but shoot much better in fast moving scenarios with the o/u. Scoping the o/u seems a bit less problematic than with a sxs in my limited personal experience.

I now have three DR's...all o/u. My next will be a SXS in a heavy caliber; 470 on up. I feel that an o/u in calibers up to, and including 9,3X74r make a trimmer and nicer handling package all in all.