I'm sure others can give more in-depth reasons to my statement, but I'm pretty sure the San Antonio one is still the Army All-American Game (sponsored by someone else now), which was traditionally THE showcase for HS football talent. However, maybe a dozen years ago now, Under Armour created their own AA football game for HS recruits. While they started off slow, I think UA's game is on par with the Army game in terms of which recruits attend and play. My memory may be failing me here, but I want to say Will Pericak played in one of the first few UA games...if not him, someone around that time period.
edit: Curiosity got to me, and I was thinking of Curtis Cunningham. Jon Major and Tuioti Mariner also played in that game.