I do not have the experience to any give informative information on visibility of line for bass. When I bass fish I use all 3 types of lines for reasons not related to visibility.
For Yellow fin tuna I do have the experience, about visibility of line and have strong opinions on the subject. I also assume tuna have equal size brains, so I wont consider brain size a factor.
If you are fishing for tuna that have received fishing pressure from sport anglers, and have dodged nets their entire life, they will not hit a live bait tied straight to any braided line. Many days they will not hit a live bait tied to a mono leader, and some days I have had to drop down from 130 to 50 pound floro to get bit.
If I go 300 miles off shore to a set of islands that are normally off limits to fishing, they will hit 130 pound floro and mono leaders, but not braid on live baits.
If the baits are suspended under a balloon or kite making them only visible on the surface line makes no difference as long as you pay attention and keep the baits flopping on the surface.
If I am trolling lures at 8 kts, on the surface or under the surface I don't care what type of line I have on and neither do the tuna. I will even use 200lbs. wire leader if Wahoo are in the area.
Bottom line is while drifting or slow trolling live bait, the tuna have lots of time to decide if they want to eat, and take a very good look before they attack. If a lure is moving fast they quickly strike and line makes no difference.
It is easy to tell if the line is making the difference because I will have several rods out with the same bait and hook, making the line the only variable. Some days are tough and going down in line size means loosing fish, it is difficult to land a 200 pound fish on 50 pound, but You have to get bit in order to catch. Pressured fish learn quick. I don't know how, or if they are smart or not, but I do know they adapt to pressure. 15 years ago an angler in my area would use 200 lbs mono leaders, thought kites were toys for kids, and wouldn't even know where to get a helium tank filled. Now even the small panga commercial fisherman have kites, helium, and fish light floro carbon. The fish have adapted some how, even if they do have small brains.
I can only guess that the chance of a bass being line shy in clear water with slow moving lures would be higher when compared to fast moving lures especially lures on the surface. As others have said heavy line that would impede action or fall rate will have much greater negative effect than line visibility. In the muddy water I bass fish, I assume line visibility is not a factor.
One more opinion formed from actual experimentation in a swimming pool. Braided line is highly visible no matter what color. In clear water white braid is the hardest to see especially looking toward the surface. Green is the most visible in a pool, but obviously may be the least visible mixed in with green vegetation or on a dark bottom ( I don't think using a black marker to mark the last few feet of line will help. Doesn't everyone say bass see black worms best?) Floro is less visible than mono, but not by much with my human eyes. I don't know how the fish see it, but I do know even poor Mexican commercial fisherman spend their hard earned money on very expensive fluorocarbon and the only reason is for visibility.