In this make believe what-if, let's talk about both cars being of equal value. Not bazillion dollar cars. Something reasonable.
Plus, these would be cars that we would have and drive and own forever. So value is not very important.
The one I'd prefer would depend on the condition of each car.
Whichever car is the most trashed, I'd opt for the other.
But, if both are in the same condition, I'd prefer Morrison's because it's a Shelby and thus has a 428 instead of the relatively-speaking boat anchor 390.