with my job, I went from a Motorola Razr, to a blackberry, to a Windows phone (Nokia), to an Android phone (Samsung), and now currently have an iPhone.
I liked the actual keyboard on the blackberry. Mine was the real old school one that had essentially a little trackball in the center to navigate.
I loved Cortana from the Windows phone. She seemed better than Siri and Google.
I loved my Samsung S7 Edge... although finding a case and screen protection for a curved screen was a nightmare.
iPhone... it is what it is. My wife has an iPhone so that makes it easier to facetime with the kids if I'm away. I guess their app store is a lot more secure and closely monitored than the Google app store.