You aren't giving people enough info to really help you.
Remember the old adage "Location, location, location ... ". Are both showcases relatively local to you?? Are the schools that attend these showcases a good fit for your son's talent level??
Different areas of the country, due the number, nature of the schools in that area dictate how/where you should decide to showcase.
Example: If you want to stay close to home, attend local showcases. If you live in the Northeast and want to attend a Texas College, you need to showcase down there.
Other than "USA", we need what state you live in and what general area he wants to go to school in.
If you have any general questions about showcasing, send a PM to TRHit ... he's always ready to help someone.