The coarse fish nets have a larger mesh that allows water to pass through more quickly. Many prefer these for catching fast fish. The "Infra-Red" Nets are supposedly harder for the fish to see, making it easier to catch them.
The soft fine mesh fish nets are a good choice for catching fish with delicate fins and small fish.
Imagine if you could be satisfied and content with your purchase. That can very much be your reality with the Aquarium Fish Nets.