Duke Vs. Dartmouth

Early Decision time is rapidly approaching and I am having a lot of trouble picking between Dartmouth and Duke. I have legacy at both and I’m Hispanic.
What I am most curious about is the difference between the two socially— I have heard mixed things about the differences between the Greek life, the quality of social life, etc.
I am also specifically interested in the difference between undergraduate computer science at the two schools.
However, I would appreciate any input.