The SQ2 is one inch longer and a half inch longer braceheight, which will make it less critical than the Firestorm. It also has a slightly higher IBO speed rating. Plus I think that the draw cycle on the SQ2 is slightly better so you should be able to draw a bit more. I also think the SQ2 is quieter. In addition should you decide to sell the bow down the road the resale on the SQ2 will be better. There's a lot of folks looking for that deal on the SQ2.