'VS makes nicer level offs. Some VNAV's are slightly better than others but none are smoother than VS.
Also used for enroute climbs. Climb thrust is quiet in the cockpit but significantly louder in the cabin, especially behind the wings. VNAV goes to climb power even for 1000' or 2000' changes. VS is pilot selectable'
Seriously, you are evaluating your use of the automation based on the 'noise in the cabin' ?
