Can't speak for Texas, but I know that joining multiple associations for a single sport/competition level (ex: high school basketball) is frowned upon rather highly here. All of the association bigwigs and assigners know each other, so it doesn't take them long to figure out if you're working for more then one of them.
My advice: figure out where each association schedules most of their games, and join the association that schedules games that are easiest for you to get to from wherever it is you'll be on gameday.
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