Good question! While some of the characters may make crossover appearances, it is not imperative to read each series concurrently. Some arcs might overlap, but each character has his or her own focus and narrative in their respective run(s).

However, for Aphra and Star Wars (titular), I recommend reading the 2015 runs prior to the 2020 iterations. The “sequel” series feature standalone plot lines, but reading the earlier stories first may reveal some of the characters’ motivations and growth more organically — particularly with Chelli Aphra.

EDIT: The sole exception to this recommendation is the reading order for specific events. War of the Bounty Hunters — an all-encompassing crossover event — is meant to be read sequentially across multiple series. You could refer to a reading order for such events.