Percy Jackson or Harry Potter, which do you prefer?

Percy Jackson has a lighter feel to it, it has funnier moments and it moves a lot quicker. Some of the untied knots in Harry Potter aren't revealed until book 7 and the overall plot line is a lot more serious. While reading the Percy Jackson books, I was aware of the fact that it was written for pre-teens since the language was very primary. Meanwhile, Harry Potter was a little more complex. Both series' are great in their own right; how can I choose which one I like better? That's like asking me which of my children is my favourite! =P