I don't know match about what is the differnence between thos two series but 2 feeder series is too much for CART. They need one and GOOD one... right decision. In which series are more drivers and how many races they currently have in one season? Sorry for Indy Lights team hope they will continue in Toyota Atlantic or whatever the name will be next year! My choice: Junior CART
Btw I also like to call the official racing serie CART not Champ Cars and I think CART it is!