I'm always intrigued on this site when the word "professional" comes into play. Maybe someone in this thread can tell my if I'm a professional or an amateur.
I'm a professor, recently published my first book with a university press, and already had a few dozen articles and other chapters in print. I don't know if I qualify as a "professional" in this conversation though. My primary source of income isn't from writing.
But more relevant to this conversation, I've experimented with a handful (<10) of different keyboard setups and have found that I prefer Apple's magic keyboard lineup. They're familiar and comfortable and I really appreciate the standardization across different machines that I work with in the day-to-day of my . . . professional? . . . work.