Both are good. In future their is wide range of scope in treatment by stem cell which may not at current state. But in community banking you are selflessly contributing to humanity, to science. You may not get such disease where you require such treatment but others can and your contributions at present can help previous generation, to other who may not have capabilities at present to do so or other members of ur family. So think widely. Do some research, consultant others also. I m only giving my point of view.