That's entirely dependent on your personal tastes. The first trilogy are considered classics films, the second trilogy, or prequel trilogy, aren't considered classics. They were harshly judged by the public, but they are good.
The Mortal Instruments - Cassandra Clare (trilogy) , Maximum Ride - James Patterson Darkest Powers - Kelley Armstrong (trilogy) , His Dark Materials - Philip Pullman (trilogy). Hope you will like them :)