I came across this poll. I think it reflects the popularity of the TV age. https://www.bbc.com/sport/formula1/46131677 I think the best driver was Jim Clark because the racing was more hazardous during his era, and I don't know about the racers before him. I'd be more curious as to what era was the most competitive. During the time I've followed F1 it seems that one team tends to dominate for a period of time.