I listened to the audiobooks, and I started with Circe. Circe is amazing, with one of the best narrations I've ever heard. Achilles is a pale shadow of Circe with a narration nowhere near the level of mastery of Perdita Weeks' performance, and yes that's a huge factor, I know, but that's how I experience most books and it has to be part of the equation.

Aside from the performance, I am just more attracted to mythological stories about gods than heroes, and I assume Miller's writing improved, since Circe came later.

I know audiobooks aren't for everybody, I used to be against them, too, but this one is so great I think everyone should try listening to it.