Plain old Android on a Samsung galaxy A-series.
I'm on Android partially out of familiarity - my first smartphone was a Samsung - but also because I like options! Let me theme it, let me use other app stores, let me install a custom OS if I feel like trying! (Mind you, I've also bricked an old phone but that was choice to try and fail miserably.)
Yeah, pop shop is just a pain. It's why I started learning how to use the command line.