This depends on the type of water that you’re throwing the line into. If you’re throwing a neon green line into clear blue water on a bright and sunny day then it will most likely scare off the fish and you will struggle to ever find a catch that way.
A lot of waters though can have a green hue where the line will blend in more subtly with the environment. Even still you have to be careful if you are using a bright green line as even then it might be too light and contrast against any darker greens that are in the water.
With any bright colors such as neon green or yellow when are best used by people who want to be able to see their line when they are fishing. If you’re the type of angler who likes to watch their line when you think that you might have a bite, then choosing a bright line would be ideal as this will mean that you can see it clearly.
This though should only be done in muddy waters. In any other circumstances you won’t have any bite to watch was the fish would have already have been scared off by the line. So if you’re not fishing in muddy waters then it’s best to avoid any brighter colors or you could be left disappointed.