whatever makes you good in software and statistics. I did a PhD in signal processing (statistical reconstruction for medical imaging) worked as a quant for 2 years, and then sofware contracting for another 2. I'm now doing some other startup stuff.
the top fields that come to mind that would be good on the EE side are machine learning, signal processing, control theory, communications/information theory. machine learning is probably the best.
and also - don't just be a matlab jocky, matlab is used heavily in industry, but if I had to do it again, i'd have learned more C++, python, and R
R and matlab are both problematic when you need to integrate with production systems, but at least R is free. Python, in my opinion is best
the top fields that come to mind that would be good on the EE side are machine learning, signal processing, control theory, communications/information theory. machine learning is probably the best.
and also - don't just be a matlab jocky, matlab is used heavily in industry, but if I had to do it again, i'd have learned more C++, python, and R
R and matlab are both problematic when you need to integrate with production systems, but at least R is free. Python, in my opinion is best