The Houston tryout is very large with 200-300 kids. It is easy to get lost in the crowd if you don't have 1-2 tools that stand out. Running speed and throwing speed are the 2 items that get kids noticed if they are not already well known by the Area Code scouts. It will take a sub 6.8 sec 60 yard dash time, 90+ mph fielding throw or a 93+ mph pitch to get much attention. Last year, the PA announcer asked pitchers that didn't throw over 90 mph not to try-out. Homeruns during BP don't do much. The scouts are watching swing mechanics not where the ball goes. Lot's of players look great in BP so it is hard to differentiate yourself on hitting alone. Hitters are best evaluated in a game. Hence, a hitter has to already be known by the Area Code scouts selecting the team. Known players will be selected with a couple extra guys considered that had standout speed or high velocity. The tryouts don't showcase heart, work ethic, in-game intelligence, excelling under pressure or many of the other qualities it takes to succeed as a player.
Based on the above, it does not matter where you try-out. The important thing is that you try -out. There are numerous college scouts in the stands that are not part of Area Code. The college scout may have seen your kid have a great game at a previous tournament with excellent At Bats against a tough pitcher but no hits for power. The try-out BP may be just what the college scout needs to see to stay hot on your kid.