I would personally think a mantis would win, because of its agility, excelent eyesight, swiftness, smartness and of course its power. It created one of the best kung fu fighting styles for crying out loud lol. The scorpion doesnt have eyesight or swiftness, put it has a lot of power, armor, poison and hairs that feel motion. Thats my opinion, just wait till the real battle begins! lol.
Joe