I always used the vinyl because I am always changing stuff and go through feet of it.
I think killernoodle is confused a bit though. Vinyl doesn't sweat at all. It is Silicon and similar tubing that does as it is more porous (sp?). Vinyl is much like plastic. About as water proof as it gets (thats why they use it for rain gear). Certainly could be wrong though. I never had any problems with sweating though.