If the Dallas area (within 1.5hrs) lakes get some much needed rain I would lean towards Dallas. But I am partial to Greenheads. And Dallas area seems to be a cleaner area and friendlier people, but thats just my opinion. West Houston area is nice though, and being able to catch trout and reds after a few limits of ducks in the morning is always a huge plus for me. Pros and cons to both.
Also keep in mind, the coast has a lot of pressure, especially from guides. And some of those guides can be rude as hell, some seem to think they own the marshes. I try to only hunt on week days and avoid all that though. And if you are gonna run the flats, a regular outboard probably wont cut it. I have a Pro Drive and it works ok out there. Airboats are best, but they are also expensive to buy and run. Tunnel hull with a jackplate seem to be able to get to all the places I can though.