Which is better, 'Bagged' or 'Bagless'?

Upright vacuums today come with so many features, it can be difficult to know where to start. One of the first decisions facing a vacuum consumer will narrow the field of options considerably:

'Bagged' vs 'Bagless'

There are no hard and fast answers to the question because each style has its own benefits and drawbacks. This choice really is a matter of personal preference but to make it easier for you, we've compiled a list of what we believe to be the benefits and drawbacks to each style:
+ The bag itself serves as a filtration device and often counts as several of the 'stages' of the vacuum's total filtration level.
- As the bag fills, particles caught in the fibers of the paper obstruct air flow decreasing the suction power and stressing the motor. The effects can be minimized by replacing bags when they are half full.
- The bags require frequent replacement increasing operating expense and maintenance.
+ Proponents of the bagged style often site convenience as a major benefit. Disposable paper bags are easy to change and offer minimum dust blow back when disposed of properly.
+ Proponents of the bagless design often report convenience as its number one benefit! Dirt cups offer a convenient and easy way to dump the dirt without the hassle of replacement bags.
- Despite the easy of use and convenient dirt cup designs, dumping the dirt into a receptacle may generate an undesirable cloud of dust blow back.
- Without the additional filtration of the bag, the exhaust filter(s) tend to clog more frequently. This increased replacement frequency tends to offset any cost savings from not having to buy replacement bags.
+ Because even a partially full bag can obstruct air flow, decreasing the suction power and stressing the motor, the bagless design may help maintain maximum suction efficiency and prolong motor life.

Which do YOU prefer?