Bid the 737. It is the only growing fleet.
You will have a much better chance to change domiciles (if you don't want EWR).
If you really want to be in IAH, then maybe the airbus is better. They are WAY overstaffed on the 737 in IAH, and the Airbus has openings.
If you want to be based in DEN or CLE….just don't kid yourself. It's probably not going to happen.