I like Harry Potter better, but I read the series in my younger, more naive days when I didn't know what a good book was. I would read them again and probably condemn them to my basement but, I would rather believe that children are reading something worthwhile.
As for the Twilight series, I never gave it a fair chance. I read one chapter and thought, "Wait, do I really want to get myself involved in this craze that is sweeping the nation?" Then I put the book down and ran out of B&B, never looking back.