Nothing really compares to the Nats, Iola is probally about the same size but the Nats is all MOPAR, and lots of vendors, parts, other things to do. Colombus has a kickass zoo, among other things. And the Nats is right on a dragstrip... nuff said!
x2 IMO any car show that takes place at a dragstrip is the only way to go.. I've been to Iola and there is NO comparison. Other then they are both car shows.