Well this depends. What is your interest? You should take that up. However, Mechatronics will be having a narrower score in terms of applications as compared to Mechanical. You see earlier there was no Mechatronics. There was just Mechanical Engineering. Then came Mechatronics as a specialization but the parent branch still is Mechanical. When we look at it in terms of jobs, this again holds good. If you see Mechatronics is not offered by any of the IITs and the NITs too. Jobs for Mechatronics people will be in the Mechanical domain itself. So I dont see much difference.