I'd say there's alot of variables that come into effect; location, water clarity, species, etc...
I fish alot of Rivers that are tannic and muddy so line visibility isn't my first concern. Strength is because snags are everywhere, so for me I fish straight braid 95% of the time and no less than 30lb test. That might be extreme for a small mouth northern guy, but for my area, it's normal.
Ihave a few clear water ponds I fish and when I do I use a flouro leader tied with an fg knot, but I think ultimately it is a bass fisherman's personal preference as to what his opinions are on line choice/leaders.
Great question though, I enjoy a good line visibility debate haha!