I really like pretty much all of his books.
Some of my favourites are:
Desperation
The Regulators
Black House
The Talisman
The Shining
Needful Things
IT
11/22/63
I haven't read as much of his more recent stuff post 2010 and what I have was OK.
If I have to recommend one book (which is really fucking hard) I would say probably The Talisman. I think...... Hahaha
cheeky edit I just remembered Under The Dome, fucking loved that, we'll ignore the TV shoe however.....