Hi Krishna,,
as you have more than 7 yrs. of expertise, you might have learned the basic flow od data in both the modules, when it comes to take any decision in between these two. i will prefer you to go with MM module, as MM module has more exposure than SD module (what i have seen in my entire life).
But plesae ask to yourself before taking any decision, because later its you who have to servive, that means you can judge yourself about the module that is more relevant to your passion.
