Larger SUP fins can provide more stability and tracking for a stand-up paddleboard (SUP), but they may not be the best option for all conditions and riding styles.
Larger fins are generally better for larger and more powerful waves, as they provide more surface area in the water and allow for greater control in choppy conditions. They also provide more stability and tracking, which is important for longer distance paddling and touring.
However, larger stand up paddle board fins can also create more drag in the water, which can make the board less manoeuvrable and slower in smaller waves or weaker currents. They also may make the board less responsive and more difficult to turn in tight spaces.
Smaller SUP fins, on the other hand, can provide a looser and more skate-like feel, which is preferred by some riders, especially in small waves or weaker currents. They also offer more manoeuvrability and responsiveness, which is great for surf-style riding.
It's important to note that the size of the fin depends on the type of waves, the rider's skill level, and the riding style. A skilled rider may prefer a larger fin in larger waves and smaller fin in smaller waves, while a beginner may prefer a larger fin for stability and tracking.