Just how important is visibility regarding the fish's ability to see the line and/or stay away because they can see the line? I see guys fishing jigs with a 12 inch leader with as many as 3 large split shot attached to the leader and they catch a lot of fish. I've always been more concerned with the presentation of the bait/fly/lure regarding leader. Especially fly fishing. There is an old Jim Teeny video I believe was called "Breaking Tradition". In that video he uses 10 or 12 pound test with a knot tied a few inches up from the fly with a huge split shot above that. The knot is used to keep the fly from slipping down. He slays the summer run steelhead in low clear water. When the camera shows the fly under water the line looks like rope! But, he catches fish!
I like Maxima Ultra Green. It's soft and you can pull a truck with 10 pound test.