RE:what fly line for flats fishing?
Good discussion, food for thought. I find that I seldom do the double-dipper casts in northern waters although there are definitely times when I wish I could avoid a lot of stripping. A big roll (switch) cast saves mucho effort and time as well, even with a full sink line.
Given one line it would be a clear intermediate and I have no complaints about the 444 clear int line I have been abusing for two seasons.