Dune and the Foundation series are by far my favorite SF series. The reason? Both have unparalleled universe depth. To today I still recite the Dune fear prayer

Dune and the Foundation series are by far my favorite SF series. The reason? Both have unparalleled universe depth. To today I still recite the Dune fear prayer to myself once in a while, I still think about how the Foundationeers used technology as a means to control the Galaxy after the fall of the Empire, I still think of spice as several natural resources on Earth today, etc. I believe all the books in the Dune series are valuable and even enjoyed the prequels since they gave a background to the story that was just lightly touched in the originals. For me, they completed the Universe and helped me answer the "Why did they do/think...?" P.S. The Dune 1 game also ruled! It was the first game on my 486 and boy did it help me get a lot of ladies :)