A company that allows you to pick off whatever spot market freight from wherever you can find it for the lowest possible percentage is the best one. One that allows you to book and negotiate rates on your own loads. Also getting access to freight bills, which they are required by law to show you, should be a simple straightforward process of simply asking for and having it emailed to you in a timely fashion. Anything else, with regards to sharing that specific info, is a BIG red flag that you are dealing with and/or working for a shady carrier that is cutting more than what the contract states is their precentage and stealing from you. It is hard to say whether one carrier taking 10% versus another taking 30% is better or not without knowing their contract rates. What sorts of opportunity do they have with spot freight or is it all contract freight? With spot pricing it's whatever you can get so obviously the less the carrier takes the better.