I read City first, so naturally preferred that version as it fleshes out the detail more. When I first read it over 30 years ago I thought "cool ideas", but re-reading more recently it occurred to me that computers had only been in existence for a couple of years when he wrote it, and yet he was already thinking in terms of AI and immersive shared VR environments. Amazing

Try "The City and the Stars". Written in 1948 under the original title "Against the Fall of Night", its his first work and contains some amazing ideas including massively multiplayer VR games, AI, stellar engineering, animated holographic art and other concepts waay ahead of their time.