Maybe I should ask which of two camps you prefer?
Camp #1: Most powerful, largest, heaviest, get all the dirt possible or
Camp #2: Moderately powerful, small, lightweight, and moderate cleaning ability.
For me, I want to get all the dirt possible (power) and also clean as quickly as possible (maneuverability), so there is a slight convenience factor. My G4 (23 lbs.) with very high airflow, good agitation and super easy to push (can be driven with your thumb and forefinger) fits the bill.
BUT, I regularly rotate through all my vacuums as daily drivers. All are maintained perfectly and used as much as possible.
Bill