Who should I choose ?

To be honest, it seems like you have no idea what you want right now. You are in a busy career and the first thing is to ask yourself if you are really ready to get into something right now? You seem like a very smart person so what I think would be best is to take a step back and decide what you are looking for most in a guy and what you want out of a relationship. Once that is done then you decide off of that with who the guy for you is. Show them who you really are and maybe go to dinner or something with them, not exclusively dating, and see how the nights go?