I would rely on word of mouth and suggest that you ask your local golf pros for their recommendations. As far as putting your game in the hands of the best, let me suggest this strategy.
Coaches tend to have specialties.
If you are planning to intensify your training, I would recommend that you go to more than one golf academy. Try several and you will learn something different from each one. Seek out those who are willing to admit to their strengths. On the other hand, some parents just want their kids to rub shoulders with the big names. If that is your choice, go for the names rather than content.