There are several old threads discussing stereotypes between the different collges.
http://talk.collegeconfidential.com/university-california-san-diego/2102539-please-help-me-rank-ucsd-colleges.html
Sixth College moved into a brand new building/location this year. Seventh is the newest college but is located farthest from campus.
If you have AP credits, you might also evaluate which college gives you the most credit. https://www.ucsd.edu/catalog/pdf/APC-chart.pdf