CE is preferred over CS (again, employers have some sort of obsession with engineers). EE is slightly better than CE and CS because there is simply a greater number of EE focused patent applications to be written. CE might be less and less desired in the future depending on how the In re Bilski case gets interpreted by the courts and Patent Office. It's complicated, but due to this court decision, it's harder to patent software and business methods. Do a little research on the case if you're curious. There's been a lot written about it because it's a big deal.