It is water resistant and is faster, according to Geekbench and the like. Some say the camera is better, others say it's not as good. It also has expandable storage, if you're into that kind of thing. The S6 is still very much up to date, but you could buy the S6 and save the extra money for the S8 if you're the type who upgrades frequently. They are both very similar and have their pros and cons, but you should go to Best Buy or your carrier and see them both in person before you make your final decision.