The most popular line used for catfishing is a monofilament fishing line because it is strong, inexpensive, and resistant to damage. It is a very forgiving line, which can be great for anglers who are learning new skills. However, a few downsides to monofilament fishing lines are that they are thicker and create more drag in the water. It can also stretch, which causes it to break off or snap when caught.
Another line that can be used for catfishing is braided fishing line. The biggest advantage of braided fishing lines is that they have no stretch so that you can immediately set the hook. It is also thinner, which means less drag in the water. The downfall to a braided line is that anglers often buy line too thick, which can damage the eyelets of your catfish rods. It is also more expensive than monofilament fishing lines.
Additionally, the fluorocarbon fishing line may be used as a leader for catfishing. It is strong and resistant to abrasions, which makes it perfect to set your catfish bait. But it is not widely used for catfishing because it is expensive.