Well, personally, I have both bagged & bagless vacuums in my household. And I prefer both. Reason being is the main problem I have always had with bagged vacuums is even the ones that use HEPA bags seem to lose power quickly. Only exceptions being my 2 Miele canisters using the AirClean bags, & Kirby & Royal metal uprights using the HEPA Cloth bags. All the multi-cyclonic vacuums I have ever owned or used, they solved the problem of losing power quickly. However, if I had to choose, I would choose a bagged vacuum if I could only own 1 vacuum. Why?? Because bagless vacuums are so darn messy!! I have yet to see a bagless vacuum that doesn't get hair or muck trapped around the cyclonic shroud inside the bin. Plus, you have the mesh filter that needs washing occasionally & will eventually get clogged anyways & make it lose power. Plus, some vacuums, like my new Electrolux UltraCaptic, actually state in the owners manual it is suggested the mesh filter be replaced once every 2 years, so have you really saved anything if you have to pay to replace the filter? NO! Until they can TRULY make a mess-free multi-cyclonic vacuum AND make it so both the mesh filter & HEPA filter last the lifetime of the vacuum, I'll prefer bag vacuums over bagless vacuums if I ultimately had to choose.
Rob