I love my little school. 11,000 students rock on! To begin with, I have never been in a class with over 40 students and the bigger classes were usualy nite classes where the continuing studies adults joined us, or we joined them depending on how you look at it. Professors I had fall semester freshmen year still know who i am two years later. i never have over a 5 minute walk to class. the list goes on.
as for my sorority, with the addition of 14 new girls this semester we have a total of 38 sisters. I think the biggest sorority on campus (there are 3 others) has 50 girls. My new member class ad 4 other girls besides myself and last spring's formal recruitment brought us 7 great ladies. I could talk probably for at least 15 minutes about every sister, telling you her position in our org, what she does outside of it, her major, her goals etc. it's amazing to have people you can be that close with. sometimes I think being at a bigger school with a bigger chapter would be interesting and maybe fun to do but I think I would be overwhelmed way too quickly. i don't always eat meals with sisters, our formal is more like a semi-formal, we don't use an outside photographer for events , recruitment is low key, and our house is full with 6 sisters. and really, i don't think i'd have it any other way.
there are definely benefits both ways.