I read several of his books years ago, time for a re-read on them I think. Like you I do not have one single book I liked enough to call my "favorite" I do have a lot of books I like and call my favorite at one time or another, but one series (Trilogy) I re-read every year is W.M. Gear's Spider series. I like the concept of self responsibility and his concept of god in the story, plus it is just a very good read.