F-35 is designed to replace mainly F-16 and is smaller and lighter aircraft that has multiple roles and will be deployed by all 3 branches of military that has fighters - Navy, Marine, Air Force (hence the name joint strike fighter). F-22 is a large aircraft that is designed to replace USAF F-15. It's main function/asset is superior air-to-air combat/intercept, which as Kaplan mentioned in the piece, not all that useful in the post cold war world.