Ford has dominated with the T, A and 30's coupes.
But Chevy has dominated in the 50's-1980 with the tri 5 cars of the Fifties, The full size and mid size cars of the 60's, the Camaro and the Corvette.
For in the later years had the Mustang.
The number of reproduction parts are a good indicator on what has been and is the biggest models for collectors and GM has been very dominate there.
As for trucks both are strong and equal from the 70's back.
While Ford has cars collectors go after they are often more difficult to find and restore due to the lack of parts for some. It was worse but it has gotten better but to be a Ford restorer it is not always easy.
I my self had a 63 Galxie that finding parts for meant going to the junk yard and hoping you find something usable while I could build a 55 Chevy from new reproduction parts.
Ford Sold more cars in 57 but Chevy owns the year in collectable models.
Ford did suffer many rust issues too so used models can be a challenge to find and expensive to restore. My buddies dad restored a 62 Sport Roadster T bird. Today there are more parts but still to get metal he had to search Arizona for sheet metal worth using.
Chevy also was first in the hobby as many of the parts interchanged over the years as well the engine parts. This made for a strong aftermarket so rebuilding was cheaper.
Ford followed in second place and now both are seeing good values. The is why Mopar is hot today as it is their turn. Many years you could buy Mopar's cheap as they were not the hot ticket as their time had not come. Now it has.
In the future it is hard to read as new cars will be very difficult to restore as parts are discontinued in many. Junk yard no longer hold cars for years and scrap many with in weeks., Some like the Camaro, Corvette and Mustang will have suppliers but many other cars you will have to get lucky with NOS parts, make the parts or find a good parts car.
The gaskets for a Fiero T top have sold for $1500 for NOS set. Used sets are rare and good used sets even more rare. So little demand for the gaskets have made it tough for anyone to tool up for a production run. This is a common thing for many cars of the 80's and 90's.
Availability, Value and affordability can play a big roll in what gets restored and what gets passed over.
120 years of unmined automobilia, and we get another Ford vs. Chevy piece. If you're first an insurance company looking to write evermore policies by cynically calling everything out of the Kelley Blue Book "classic" you can't go wrong going for EZ numbers, masquerading as a serious automotive magazine whether print or digital.
Now and then, a good article on some facet of automotive history by Don Sherman and Aaron Robinson, but otherwise, expect evermore of the above. Your reactions, feedback to round robins like the above help Hagerty fine-hone their advertising.
Easier and cheaper to mildly entertain the masses than fascinate the classes.