NSLC seems more serious to me, while Summer@Brown is probably more of a social experience. However, Summer@Brown is a little bit cheaper and is for 2 weeks, while NSLC is for 9 days. Which do you think would be more worth going to?
I got invited to NSLC, but the Abnormal Psych course at Summer @ Brown was exactly what I was looking for. Depends on what kind of course you want!