Many sci-fi and fantasy authors spend so much time world-building that they seem to forget the plot for 20 pages or so. On the other end some just put in sequences of action with only a token plot like many movies today. Finding one that has the right balance is very difficult. Back when before electronic books, more than a few paperbacks ended up being tossed across the room in frustration.
Since you've gotten a lot of recommendations for more popular works, I'll toss in few less commonly mentioned ones. All of these have a decent balance of world-building and plot.
Crystal Singer by Anne McCaffrey.
The Madness Season & This Alien Shore - C.S. Friedman.
The Parafaith War - L. E. Modesitt Jr.
Murderbot series - Martha Wells - lots of space travel and world building, but it's funny as hell so it's worth it.