Redsox8191,
I would attend the events where the college coaches will be for the schools your son is interested in attending. Why fish in a lake when you don't know what your going to catch?
It is very difficult to stand out at one event if it is a PG Showcase or WWBA. I would think most coaches are looking at a body of work and a history of success on the field (and possibly in the classroom). Most coaches that were interested in my son over the last few years, saw him play a number of times at a bunch of different events. It is a difficult question. If I had to pick, I would play with a top level travel team because you would be establishing a body of work over a season, and get the benefits of coaching and possibl exposure.