How to make an informed decision on which vacuum cleaner you should purchase for your housekeeping

How to make an informed decision on which vacuum cleaner you should purchase for your housekeeping.
Bagless vacuum systems uses cyclonic technology for deep clean. What makes cyclonic cleaner different from old-style cleaner?
Old style vacuum cleaner suck up the dirt and captured in the dust container. Air sucked up, passes through a filter which catches the dust. When the filter clogs with dust suction is reduced.