Pendragon:
* Series Length: 6 books
* Target Audience: Young Adult/Adult
* Publication Date: First book published in 1999
* Critical Reception: Generally positive, praised for its rich world-building and complex characters.
* Commercial Success: Moderately successful, selling over 1 million copies.
Artemis Fowl:
* Series Length: 8 books
* Target Audience: Middle Grade/Young Adult
* Publication Date: First book published in 2001
* Critical Reception: Mostly positive, praised for its clever plot and imaginative world.
* Commercial Success: Extremely successful, selling over 25 million copies worldwide, adapted into a film (though not universally well-received).
Conclusion:
While both series have a dedicated fanbase, Artemis Fowl appears to be more popular overall, judging by sales figures and broader recognition. However, Pendragon holds its own in terms of critical acclaim and has a devoted following.
Ultimately, the "more popular" series depends on your definition of popularity and what you value in a book.