Just my two cents..
Although I think Hoover had a good vacuum, a Eureka will out clean a Hoover anytime. If you vacuum in your bare feet, you can feel the Hoover sending dirt back at your feet.
The early model Eureka with the all brush Distribulator brush roll was an awesome cleaner. The woodin brush roll with the replaceable beater bar was not as good as the Vibra Groomer One or Two.
The F&G bag was far superior to the C bag of that time period. Now that they have made the ST bag, it makes any older model Eureka a fine vacuum with much better filtration.
The later model Eureka that used the front mount attachment sets that covered the brush roll were much better than the rear conversion of the Hoover at the time. When Hoover went to the front mount, that also improved.
Eureka always had a longer cord, full wrap bumper, most had a handle grip...the Dail-a-nap was a much better design for rug height adjustment as well. It kept the nozzle level to the carpet.
I think the design speaks for itself as it is still in use today and still very popular.