The 30's have traditionally been considered the "Golden Age" of motorsports. The racetracks were unforgiving, the cars had insane power for their grip, there were many great races, and it was more likely to see a driver really shine in rubbish machinery. The 1933 Grand Prix of Monaco (which saw
21 lead changes in 100 laps. At Monaco. The battlers were arch rivals Nuvolari and Varzi) and the 1935 German Grand Prix, were definitely highlights of the era.
Racing cars before 1930, were just, well, a little
too slow for my tastes.
The 50's and 60's are also a commonly referenced era. This era saw the likes of Ferrari and Porsche replacing the old guard of Alfa Romeo and Mercedes-Benz. Colin Chapman's Lotus also came to fame in this era, bringing his philosophy of lightness to the forefront of racing car design. The cars were sexy and fast, the tracks were still very unforgiving, and more dangerous than before with the quicker cornering speeds, and there were a few rags to riches stories in F1 from this era. Jim Clark, Graham Hill, Jack Brabham, and Dan Gurney to name a few; the former two coming from very surprising backgrounds, the latter two winning races in their own cars.
The 80's also deserve a mention. To me this era is like a blend of the new and old. Safety standards had really progressed in leaps and bounds, but the cars were more powerful than ever. It was a point where the cars were insanely fast, and still required a great deal of control to use. Drivers using the traditional H-Gate shifter and clutch pedal with 900HP monsters (or 500HP, on dirt...) is something that has to be seen to be believed. Was a great time for endurance racing as well. It's hard to imagine ever going back to 1980s performance figures in those categories of motorsport.
I could go on and on about these eras, but essentially, each decade of motorsport has its own charm.
To me, based on videos, photos, and articles, the 1930s would be the "Golden Era," 1960s the "Silver Era," and the 1980s the "Bronze Era," if I had to sort them. But really, nearly every era of motosport is fascinating. 👍