S-A versus T-R?

Hello, I’m considering doing Explore for for the first time in the summer session (Spring interferes with classes) and am debating between Saint-Anne and Trois-Rivières. I haven’t touched French since the ninth grade so I want to genuinely improve it. However, I know that S-A for the summer term is 16+ and really don’t want to be surrounded by high-schoolers. Can anyone share their experience as a university student or older in a younger session or just their experience between these two sessions generally?