I'm a Mechanical Engineering student at the 4th semester, and I've been thinking about what specializations I should pursue after I get my bachelor's degree. I've always find mechatronics (control and automation) to be quite fun. I've developed some projects using Arduino and studied a little bit of control theory. On the other side, thermal and fluids also looks like a good specialization. I think studying things like propulsion and turbomachinery would be great, since I have an interest in aircraft. So my question is: which specialization offers the best job prospects and has the most applications?