I havent personally tried either but a friend of mine bought a tub of cellucor m5 and swears by it. I will most likely snag a scoop from him in the next couple of days and try it for myself. He says the pump he gets from it is amazing. The taste apparently isnt the greatest, but thats not why we drink em, right? I havent heard anything about pre surge unleashed...Why not go with the cellucor m5 if you have the exta cash to shell out. If you do, let me us know how it treats ya.