1 Different forces: SUP paddleboards and surfboards can both surf, but the most obvious difference between the two is that stand-up paddleboards or SUPs use paddles to move, while surfboards use the surfer's body and the hands act as paddles , and then ride the waves or steer depending on the offset of the center of gravity.
2 Different shapes: Stand-up paddleboards and surfboards vary widely in size. SUP boards are much longer, generally over 10'6, and usually heavier and thicker. Surfboards typically range in size from 5 to 9 feet and are lighter. The reason for the difference is the purpose of the surfboard. When the SUP board is gliding at sea, it is usually for better stability in the water. Surfboards are meant to be ridden with or along the waves, requiring greater mobility and flexibility.
Stand-up surfboard water sports inflatable surfboard sup paddle board paddle board stand-up paddle board beginner
3 Different volumes: Stand-up paddleboards generally have more volume than surfboards. More volume usually means thicker (sometimes), longer (almost always) and wider (and almost always), and the benefit of having more volume is that it can be easier to catch waves.
4 Riding the waves the same: SUP surfers and surfers can ride the same waves, but since SUP boards are larger, less responsive and less maneuverable than surfboards, dangerous surfing in crowded areas unless you are Surf and SUP surfer master.