From a distance for sure, but I'm not even experienced enough to tell the quality difference close up.
if you're looking at MT, GB and Albin's I suspect you're looking at 70's - 86ish boats. (Also try Mainship 34)
In my experience, with a boat of that vintage you'll find similar types of issues which if unattended to greatly decrease the integrity, quality and value of the boat.
IMO, in that vintage, quality is based on how the boat was maintained not necessarily by manufacturer.
Obvious items to note right away, soggy decks, wood that sounds like a thud when hit, smokey diesels, what color smoke?, cabins that smell like diesel, lots of caulk in deck hardware, loose deck hardware, motor mounts in stringers that are loose, leaking or poor condition fuel tanks, unkept canvas, unkept wiring & messy engine rooms, hot water heater, is it leaking?, ect.
Read boat surveys, survey multiple boats, take oil samples, ask questions of people, talk with surveyors.
In my experience, it's well work a few $600 surveys to learn and flush out the boat that do not fill your needs.
All that being said. I do not have enough experiences with the maintenance and repairs of the standard Perkins or Ford diesels and the various gensets that generally come in these boat. Someone else maybe able to provide a comparison.
Good luck.