Which do you want more?
Which fits you best? (Vettes will be similar of course, but I have seen a set of seats completely change the experience of driving a vehicle).
Budget wise these seem like a bit of a range. If you only have 1 example of each to judge... buy the best car that needs the least work is usually good advice.
Corvette has huge club following, Mazdas are cool. More posters here will tell you to get a Vette.
Most 1929 sedans look very similar.
This is true in 1953... (Studebaker excepted)
This is true in 1964... (Put Galaxie tailights on an Impala and you could fool many)
Cookie-cookie is just the typical styling of a given period. Some cars stray outside the boundaries with details (AMC Matador). Vans and Pickups really exemplify this.
Usually something is the standout of a particular phase. 1956 F100, 1957 Chevy in popular imagination (though really the 55 was the innovative design for North America with that grill)... I generally lean towards Pontiac owning the crown of wearing stacked dual quad headlights the best, but others did it well, etc.
uni-body junk and fwd are two other/different topics.
I will say that unibody and junk aren't terms that are predictive of each other. Some "junk" ends up revered too.
Toronado gen 1 was one of the best (over) engineered vehicles ever.