you probably wont notice much, Surface Nine Lifes are gonna be a bit softer and poppier than El Reys, and they a have sidewall construction so the edge hold will be better, but the El Reys will be lighter and more durable with the cap construction and S7 base. Its all about preferences, but if you can get El Reys for cheap then go with them, there's absolutely nothing wrong with them, they are a good ski all-around.