which brokerage house is good for a sub-broker in terms of brokerage shared?


This is my first post on traderji, I have been trying to study different brokerage houses to come to one conclusion, which is good for the following:

1) for a sub-broker in terms of best brokerage shared
2) good for the sub-brokers clients mainly corporate executives ( middle and upper management) - good in customer service and grivance solving
3) good long term relationship a sub broker can develop with the brokerage house.

any information is welcome, it will aid me in my decision making which is mainly based on that brokerage house which can take care of my clients in the sme way I have taken care for the last decade.

regards and waiting for some advise and suggestions from all of you