I think the '68 was a cooler car. Just my opinion.
Yes, I would take either the '64 or my old '68 nowadays. However, I always liked the '63 and '64 Chevys. Actually I would like to have the 1962 327 Corvette I was offered in 1972 for $1800! Just out of the service, I had $900 in my wallet, a new wife and no job. "Ain't" that the way it works?