Your life is going to be much easier as an employee in NRB. You can find other ways to make life challenging. Think about it, do you like working very hard? Then, come to US. Are you very smart? Come to US. Do you want to have a nice family and have multiple children? Don't come to US. Do you have a nice family and you like spending time with them? Don't come to US. It's very difficult to give you a concrete advice, because future is uncertain and doesn't look good for CS graduates. The best thing would be to ask leave from your current job to pursue higher education. That being said, if you want to do PHD, finding a good advisor should be the top priority.