For Berkeley EECS versus L&S CS as a transfer:
- EECS is probably more difficult for admission.
- However, if you are admitted to EECS, you are in the major, while if you are admitted to L&S, you must complete the remaining prerequisites with a GPA of 3.30 to enter the L&S CS major. See http://www.eecs.berkeley.edu/csugrad/#petitioning .
- EECS has additional physics, math, and EE requirements compared to L&S CS.
In either case, you may have to take most or all of CS 61A, 61B, 61C, 70 and EE 16A (and 16B for EECS) after transfer, unless some of the courses you take at WUStL are accepted as equivalent to them. This could result in needing an extra semester to graduate.
You can preview the Berkeley EE and CS courses at http://www-inst.eecs.berkeley.edu/classes-eecs.html .