D20 chose an LLC for 2nd year of college, is abroad this year and will be returning to LLC for senior year. I agree with @collegemom3717 that picking an LLC based on your child’s academic or social interests a great choice.
My observation with substance free/alcohol free housing is that parents are often driving that choice, rather than the students. The students I know who made the choice themselves were students who have/had an issue with substances they were now actively trying to avoid/reanimate.