Focusing on Anakin, this viewing order builds up Anakin and Darth Vader separately, making the ROTS twist even more impactful than the Empire one. It also includes the Clone Wars TV-series and Rogue One. Ep. 7-9 can be watched afterwards.
Star Wars: Episode I - The Phantom Menace⧉×
Star Wars: Episode II - Attack of the Clones⧉×
Star Wars: The Clone Wars (TV show, starts here, takes place over 3 standard years)⧉×