I haven't read The Passenger so I have no connection to the story or characters so for me this was essentially a blank slate and I enjoyed it. I listened to the audiobook as I saw Julia Whelan was one of the narrators and I adore her! Both narrators were excellent and I really liked it being purely casefiles made up of interviews. 
There's a story but this is more a deep dive into mathematics, mental health and philosophical musings around life.