Rose copper lens is great for moderate sun, particularly while driving. I noticed, that my eyes are getting a bit tired if I wear this lens for a couple of hours, so I would recommend to use it, when you need more contrast vision for a limited period of time. In other situations smoke gray lens does its job.
Yellow lens is great for fog, rain, night conditions. No problem to drive 5-6 hours, safe from being blinded by counter-current headlights.
Pros: Require nearly no space in bag or pockets
This review was written in the old system and had content requirements that are different than reviews written today.