2013 OF,
I think the Stanford Camp is great. I don't know anything about the costs involved, but if it is doable I would stick to the Stanford Camp.
That said, in the interest of accuracy, I doubt if there is better exposure anywhere for talented 16 U players other than the WWBA event This event will have hundreds, if not a thousand or more, future DI players and/or future draft picks. They are from every part of the country, many of the very best 16U programs. College recruiters are more interested in underclassmen than ever before. When this much talent is in one area, and playing for keeps, it is not ignored by those who recruit talent.
I do think the Stanford camp will draw more interest from smaller colleges. And the truth is, good players are going to stick out at the camp. The WWBA 16U has games spread out so that means the recruiters won't be able to see everything that happens. Though, through Game Changer and the PG database they will have information on every player and everything that happens.
The main reason I suggested you attend the Stanford Camp is because it sounded like you have "committed" to attend and it's a great event. Several of the same recruiters will be at both events. You mentioned being invited to play with a top program, but not their #1 team. The #1 team is likely to draw more interest,
Either place you go, the resulting interest will be based on your ability level and your academic level. Best of luck!