Brian Kernighan shares what hardware and software he uses. He also talks about what he doesn't use:
A couple of Kindles for my wife; I don’t care to read on them, so they’re not much used. An iPad, unused. A 7 inch Android tablet, ditto. Several cell phones, none turned on; the one that I actually use (about once a month) is a Samsung feature phone from 5 or 6 years ago.