Bennington is highly ranked for theater. The field work term might be useful. Then again Sarah Lawrence is close to NYC.
Here is an article for grad applicants to use in deciding.Might be helpful for undergrad too.
Grad Program in Drama and Dramatics/Theatre Arts | The Princeton Review
Theater Program | Bennington College
The Best Colleges For Theater: Princeton Review List | HuffPost
Theatre | Sarah Lawrence College
This ranking has Sarah Lawrence at #16 and no mention of Bennington Best College Theater | The Princeton Review
The rankings obviously vary depending on criteria. I would honestly decide based on other factors since both are good for theater. Bennington is a beautiful campus in VT and Sarah Lawrence is a beautiful campus in a suburb of NYC. Look at program structure, performance opportunities, social factors and of course “vibe.”
Here are some other threads:
Sarah Lawrence vs. Bennington vs. Hampshire - Colleges and Universities / Sarah Lawrence College - College Confidential Forums