I'd get the S5. Not only because I'm an Android guy, but because it has a user-replacable battery, takes Micro-SD cards if you need extra storage and is IP67-classed which means it's much more resilient than the iPhone 6. I remember one guy in another forum saying that he read the news on his S5 while he was in the shower, which is just awesome. The iPhone does come with a high-speed camera though, so there's that I guess.