I had the Galaxy s4 before this and loved it. Never had an issue with it. The s6, on the other hand, has been nothing but trouble. I've had to replace it at least 4 times due to "manufacturer defect". The first time was because it kept freezing whenever I would open and use certain apps.
Strong screen; hard to break; High quality display; Memory
Battery great at first but quickly deteriorates; Camera quality; Call quality; Running multiple apps slows it down extremely; No removable memory card; No removable battery