What's a title that is worth it (to you) to have both the physical copy and the audiobook?

The Expanse is political/corporate intrigue set in the 24th century after humans have extended mining to the rings of Saturn. There are three major political camps:

• the United Nations of Earth and Luna — a bloated, old, slow, and traditional nation that has the only source of live soil samples, punishing universal basic income, and 30 billion mouths to feed. They are the "takers".

• the Martian Congressional Republic — a trim, agile, militaristic, and focused nation that makes technological advances and works hard to stay alive on a hostile world. They are the "dusters".

• the diffuse factions known under the umbrella term "Belters." They are the workers, the downtrodden, the neglected, and the subjects of the great nations' impunity. In a few short generations, their bodies changed, adapting to the ravages of microgravity and zero G. Their needs are simple: air, water, food. Their work is hard. Their lives are nasty, brutish, and short. But, they love fiercely, have a language and culture all their own, and refuse to bow before Earth and Mars.

"In fair Sol system, where we lay our scene, From ancient grudge break to new mutiny, Where civil blood makes civil hands unclean."

The Expanse series is narrated by Jefferson Mayes. He is absolutely magnificent and really does bring the books to life.