I agree with all of the above. Not all WWBAs are created equal. Now that PG is not at Lake Point anymore, it's harder to tell which one is the best now. The WWBA World Series are usually the way to go, so see if this new team will attend. Tomball Texas and Hoover Alabama are the new top locations I believe. In the past, hundreds of coaches attended these tournaments. But, if they didn't know who your kid was, you had to hope a coach just happened to be at the field when/if your son played like a beast. So, your son must be in contact with coaches in advance (which included sending over the game schedule a few days before) and the travel coach must be willing to go to bat (pun intended) for your son. Some players have their transcripts and scores with them in case a coach seeks them out. Not necessary, but it can be helpful. Our coaches always gave out a team roster to any coaches that were there. This actually led to a few pitchers being seen and getting offers. It's very helpful.
We did both TC events and DN. Never saw coaches at TC and only certain DN weeks are when many coaches attend. As you can see when you look at the summer schedule, they do many, many tournaments. In the past, it has been the Super 17 events in June.
It might make sense for your son to directly ask coaches which events they attend so it may better help him decide what to do.
It's a long slog through the recruiting process. But, this summer is critical. Make sure you gather videos during his HS season to share with coaches too. And get out there and see campuses. At this point, you do not want to waste time on schools that are not a good fit.
Godspeed!!