Q: Which would you rather have? (i.e. performs better, looks better, etc.)
A: Is the '64 barracuda the bubble back window body ?? I've driven lots of Mustangs and also the '64 or '65 Barracuda bubble back with a 318 V 8. The 318 without any smog controls will pin you to your seat !!! It is much more rare than the 'stang. The A body Fish were replaced by E bodies in 1970. If you want go go fast there's only two answers '70 or '71 Barracuda, or 1972 Plymouth Satellite. I'll take my satellite in Gringo Green, 340 Biturbo, intercooled, waste gate at 11 psi. That gives a 0 -60 under 4.0 seconds, about all you can put on the street. Get a radar detector !!