Problem is that I have a iMac, iPad and iPhone
When I take a picture on my phone it uploads to all my devices back at home (I work away from home) so that is very handy
Also if my wife takes pictures on the iPad at home I get them on photostream on my iPhone you don't have to send them it's great to see pics of my son taken during the day when I get back home
The problem part is that if I change to samsung I loose all this photo streaming stuff and then my devices are not integrated and basically not using the full potential of the apple devices
So I am stuck with Apple now or should I say I've been taken in by their marketing strategy! Very naughty of them
Funny, I have the same kind of usage case (With friends and relatives instead of a wife and kid), and I use Microsoft services.
The best part is, I'm not tied to Apple devices, like you say you are. MS uses their OneDrive for that sync and backup, and the app is available on all devices, including Android and iOS, not just Microsoft ones. There's a web interface as well, so I can see my documents and photos on any browser.