I actually prefer bags. I have not tried the hand-held ones though.
Day and night difference. No wires to tangle, no sockets to jump between, no block to lug behind you, no pangs of lazyness from imagining having to do all that stuff.
You basically grab it off the wall, clean the mess on the spot and put it back.
Really improves your life quality, and emptying is no longer messy after some practice.
But yeah, that 100(-ish?)W brushless motor makes about as much noise as a 2KW job in a regular vac - it's all about the airflow.