Having used both, NACS is more compact, so both the port on the car and the end of the cable are significantly smaller than CCS. The cable itself is also lighter and more "usable" than CCS. At least at the newest V3 superchargers, the NACS cable is so much more flexible and easier to manage.
Munro Live took both connectors apart and did an overview: https://www.youtube.com/watch?v=gmjofPpThWU