Originally Posted by
dvs7310
As long as the codeshare is allowed (not all are unless tied to another segment), there's no reason for an agent to push you to one or the other. Should be your preference based on earning opportunity, etc. This is the benefit of an agent vs. an airline as the agent has no skin in the game per-se, they should be quite neutral vs. the airline which makes more money for themselves by using their own codes.
Some airlines have (or used to have) bonus programs based on the dollar value of tickets plated (issued) on that airline's number. Don't know if that still exists.
If you're too young to know what "plating" is, back when tickets issued by travel agents were paper with red carbon, the agencies had metal plates which they would imprint on the tickets to indicate which was the issuing carrier. Here's an example:
