I normally watch them all in chronological order, but when I want to introduce Star Wars to a newcomer, I’d recommend to watch them by year of release (Originals first, then Prequels).
Ever since I’ve come across them, David Kaylor’s Final Cuts have been my go-to way to watch the Original Trilogy from now on, because they do almost everything right - not to mention they’re in 4K UHD as well. As for the Prequels, I just watch them in their original form.