Handles hardwood floors
Hose attachments so you can vacuum the ceiling
Easy to empty
No bags to buy
Strong, strong,strong suction
Won't break after just a few years
Doesn't need constant (or frequent) servicing
Dyson? Electrolux? Dirt Devil? Hoover? Eureka?
Or -- heresy -- is there no difference at all?
I've been married almost 30 years and I've never figured out the answer to this question.