Just based on my own experience... ANY route at Smith that does not top out on a summit it is quicker to walk off NO MATTER WHAT, than rap! (MY only exception is the cinnimon slab area if it is clear enough to toss ropes down and rap than yes you might beat someone walking off, please though if its busy walk down cocaine gully) Now I know Smith routes are often set up to rap but please PLEASE walk off if you can! SERIOUSLY IF IT IS NOT A SINGLE PITCH SPORT ROUTE PLEASE FIND THE WALK OFF.
Oh and you climb a route with a walk off, and didnt walk off, YOU didnt climb the route!