I have heard that light flywheels, like 10lbs and lighter can be hard in traffic as you have to rev up higher not to stall. Also, I have been told to avoid aluminium/billet flywheels.
Clutch... depends on the application.
ACT! ACT! ACT! anything else would be uncivilized. lol. na seriously though my greatest experiences with clutchs would have to be with ACT clutches. There grrrrrreat. But they are expensive.
__________________
Im not proud of my car because its fast, Im proud of it be cause I built it that way.