This would literally be a fight for who gets the first hit. One good shot from Cyclops's energy beam would be enough to take out Storm, but as Remy has stated, all it would take to defeat Cyclops would be a single bolt of lightning. Neither character has the reflexes to evade their opponent's attack, nor the durability to keep fighting once hit. With this in mind, I can safely say that Storm is more likely to win. She can fly, making her a much harder target to hit. And while Cyclops can only blast out one beam at a time in one direction, Storm has the advantage of being able to hit him from all directions with multiple bolts of lightning.