Carlisle or Nats-which is better?

I grew up in Annandale. Its only a 2 hour trip each way for you to go to Carlisle. You will not be able to cover the whole thing in a single day. It can easily take a full day to see the show cars (and car corral), and depending on how fast you walk (and how closely you look for parts), it can take two or more days to cover all the vendors. Try to go both Friday and Saturday and plan to get there early. On Sunday its a ghost town by noon.
I will think about hitting both days possibly. I am really interested in seeing the Corral and some Dusters like mine. The swap meet will take most of my time. How long can you stay there in the evening?

I have lived in Annandale for 3 years and really like it here. I got super lucky and found a house with a 4 car shop in the backyard with lifts and AC. A goldmine find inside the beltway.