I was an Android user (last time I had was Nexus 5) and switched to iPhone 5s. I've been on this forum and defended what Android had to offer and they're better than the iOS. Turns out, they're all just the same: the same quality in call, text, and access to social media apps. I like listening to podcasts and iPhone has an organized interface compared to apps you download on Google Play. The iPhone's pre-installed podcast app was the reason I switched to iPhone.
I didn't mind about the camera. Both have 8 MP. Galaxy S6 has 16 MP. Having knowledge in photography, more MPs doesn't mean a greater image picture quality when you upload it to FB, instagram, and etc. It's all about the phone's camera sensor which collects light. If you upload a photo on FB with that S6's 16 MP, the image would be somewhat the same production as other phone competitors since they are all on par with the sensor size. If you're choosing a phone based on its 16 MPs then might as well get a Canon t5i cuz they have the same price on Amazon. The latter will guarantee you a better quality pictures that you can upload on FB and Instagram regardless if you're using an auto mode.
Don't get caught up with the 16 megapixels hype.