I have to put in a word for my Osterizer.
I guess Waring is the winner on this site, but I love my Osterizer. This is the very appliance that first got me interested in vintage wares, after SEVERAL run-ins with useless modern blenders.
I can't really add much to the discussion here, because I don't have a Waring for comparison. But one thing that has kept me in the Osterizer camp is that all their modern replacement parts fit the old machines. The design of the base has apparently never changed. In fact, I use a modern caraffe on mine, since I don't want to chip the vintage caraffe--which I assure you I would do! And I recently got some replacement blades that made the machine work even better.
I feel obligated to point out that Osterizer was Julia Child's favorite brand, back in the day. While filming the black & white French Chef in the 1960s, she wanted "either Osterizer [first choice] or General Electric--NOT Waring". This quotation is in Dana Polan's book on The French Chef, p. 135. La Julie had apparently liked the Waring in earlier years, so she must have had some reason for changing her opinion. Her last blender, the one at the Smithsonian, is a modern Cuisinart.