Blue Bay has more facilities for snorkelling I would believe.
Mont Choisy is nearest to Grand Baie, offering the best nightlife for tourists.
Anyway...its like you're comparing 2 precious stones.
"Whenever I see Pizza toppings from 2 different advertised types that I like, I often design my own pizza to include both of them and thus (that explains how bubbly I am right now) reaching a compromise."
Think about it.