Are we talking Vortex? Areotech? If so the advantage is mostly perception. Not saying they don't clean better but the biggest reason is image impressed upon the customers mind. We live in a world where many think bigger is better. With a larger truck many think they are getting more for their money. Is this true? Perhaps not as we have learned that the tech makes the biggest difference but the consumer does not know this fact.
Totally agree. One time I was cleaning a banquet hall in a church, and a lady walk by and said "wow your machine really does a great job." I said Thank you, but I was thinking in my mind its not the machine its actually me the cleaner.