scope
I believe either 'scope will be superior to an "iron sights" in about any circumstances, w/ a rifle or carbine, and provided the 'scope is of fair quality and mounted well, and of correct magnification for the job its tasked with. We are even seeing optical sights on shotguns and handguns these days.
REgards a conventionally mounted low power variable and a "scout scope"...
I have a Savage Scout w/a scout scope and coarse reticle and am pretty much convinced I shoot it better (more quickly and accurately) in snap shots, than I do a conventional scope.
But.......not by much. And a conventional low power variable, cranked up to 5x or even 7x on some models, likley has an edge on the scout at longer ranges.
I can tell you for certain that I can see and shoot, w/ a scout or a low variable, better in bad light, than w/ any peep or iron sight arrangement.
And...although I have mounted a white light on my duty carbine, I have little to no experience with dot or battery powered sights on firearms.