There is another point of view, some pax like to have an unbranded aircraft so they can pretend it's their aircraft, however, new brokers are often paranoid about logo's etc, it soon wears off. Unfortunately the lack of branding does not actually guarantee any level of integrity, as you all know there are many aircraft that are completely unbranded, but if the crew pitch your client with a business card.......
If this is not about the pax's ego, then maybe the question Zoe should be asking is which operators are known for their integrity?
Phil