they are similar in many ways... lets put it this way, they are both highly effective... GW is more versatile... it will enhance your performance more and provide more benefits but for just straight fat loss, sr is slightly stronger... its main purpose is to correct metabolic disorders... GW is my personal preference because i feel like when you enhance your performance that you get the most out of it... and NOTHING can enhance your performance as much as GW does but SR is a bit stronger for fat loss... generally i recommend taking them both...