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I don't think that they will ask you about "why didn't you choose a particular research problem, etc..". However, they will ask you "why you want to leave your current company"?. Everyday, so many people change jobs because of several reasons. I think that it is fine if you say that you are interested in their technology and would like to be part of that company. Better to focus more on your career goals, technology, etc., than benefits. It is better to avoid a topic on benefits in the starting of the interview process or if necessary put it at the end. Moreover, it is fine to pursue your career in different area than your "thesis problem". There is no wrong in that. We are human-beings and we change our tastes/opinions over the time. :-) That said, "at least" you should know why do you want to leave your current job. Good Luck.