Favorite Hoovers.
As an historian, I guess the favorite would be the model O, the one that started it all.
Aside from that, my favorites are the 541, Aire-Dyne tank, the first of the Constellations, as well as the first Pixie. Both of which I have in the two-tone blue/grey.
Then there are the stick-Vacs. The Hoover Lark, in the light blue. Rounding out the favorites has to be the the original Hoover Floor washer in yellow.
The only one I don't have is the floor washer. Used to, but that needs to be replaced.
These were all landmark models, and each made a huge impression on the American public.