I’ve got one of each but the cannister is the only one working at the moment...the upright is losing vacuum somewhere along the line.
I normally just blow the motor out, they never lasted long enough to lose vacumn power. I have the following bags, Eureka Upright Style F & G; Eureka Upright Style J; Sharp and vacumns using Type PU-2. I really like my Simplicity cannister vacumn cleaner, btw.