My opinion blackberry 10 os, I always hear people complain about problems with android and apple is and evil company and are usually over priced, the new blackberry os has been running great for me so far and they build a good durable phone as well, but they don't have as many apps but I don't use apps so I'm okay with it, I don't plan on switching back any time soon. And the layout is simple as well and easy to use, the BlackBerry hub works really well too.