I'm a mood reader. Sometimes I want a long trial, sometimes a quick fix. For this series, that doesn't work. The continuity of character is the through-line. Your mood might suit a later book's tone, but you'll sacrifice understanding. Tough luck. Read in order.
Wait, are the audiobooks narrated by the same person? Because if they are, that could influence the order too. Hearing the same voice might make bouncing around less jarring.
Look, the Netflix series might bring new fans, and they'll ask this. The answer is simple: read the books in the order they were published. The show might adapt out of order, but the books have a steadfast internal chronology. Start with 'The Lincoln Lawyer'. It's the origin story. Everything else follows from there. Trying to start with season two's source material ('The Fifth Witness') would be confusing because Haller's life situation is different. Book order equals story order. Don't complicate a good thing.
The practical answer: If you walk into a bookstore or library, they'll likely be filed in this order: 'The Lincoln Lawyer', 'The Brass Verdict', 'The Reversal', 'The Fifth Witness', 'The Gods of Guilt', 'The Law of Innocence', 'Resurrection Walk'. That's it. Don't overthink it. Grab the first one and see if you like his voice. If you do, just keep going to the right on the shelf.
I see this question pop up on Reddit every few months. The top comment is always 'Publication order.' It's the standard for a reason. The second top comment is always the chronological list. Choose your fighter.