I think there may be a similarity between this discussion on fishing line and a discussion on lures.  I think most of us will agree that fishing lures are made to appeal to fishermen.  Let's face it not too many fish buy fishing lures.  Any lure will catch fish depending where, when, who and what.  Admittedly some are better than other.  But most lures will fall within one standard deviations of the center of the bell curve.  I just can't believe a northern will ignore your lure because you have 8 pound test verses 10 pound test.  Especially, if you factor in that the super lines have a smaller diameter for the same strength.  As  far as color of line, again I just don't think the difference between clear, black, gray or whatever color really makes any difference.  I think it is great fun for a lot of people to debate the relative merits of different lines relative to color and strength.  But for anybody new to fishing, don't get too hung up on this discussion.  Just buy some good quality line.  I will agree that there is a noticeable difference between the super/braided lines and mono.  IMHO the super lines win hands down.  Finally, I recall what Al Linder said on one of his shows.  Everyone talks about natural presentation.  BUT what is naturally about a red and white Daredevil and a large number of lures which catch fish.  Nightcrawlers are not native to North America. Plus, nightcrawlers do not naturally occur in lakes, but fish will bite on nightcrawlers.

I certainly do not intend to imply that all fishermen have equal success.  Certainly, some people do much better than others.  I don't think, however, that the color or diameter of the line are major factors in catching fish.