Just from looking at the product page for a couple seconds, I can tell you that there shape/textures are different (this can make a huge difference for a person), their colours are different, their measurements are not the same, and the average vroom (power) and bee (noise) level rating are not the same. If you wanted to know more about the products, you should check out the reviews : )

Reviews for #1: link (3 reviews total)
Reviews for #2: link (5 reviews total)
Reviews for #3: link (3 reviews total)