I’ve really enjoy the We Are Legion (Bobiverse) series by Dennis E Taylor (narrated by Ray Porter)with my son over the past few years. We listen to them on audible.

The greatest fantasy/sci-fi series of all time are, in my humble opinion:

Lord of the Rings

Red Rising

Stormlight Archive

Hyperion Cantos

Wheel of Time

Chronicles of Narnia

CS Lewis’ Space Trilogy

Zones of Thought

Mistborn

What else would you add?