Which branch is best for EC Engg for mtech in electronics or in control system..?

Hello Dhanashree!
It totally depends on your interest. Scope of electronic control system are give below :
Control and automation have a lot of potential in a rapidly growing country like India. Today, there are huge plants for conventional sources of energy, steel, oil and gas which have opened a plethora of opportunities for Electronics Control Systems Engineers. The objective of systems engineers is to increase the efficiency of these plants by reducing the output cost. The thrust being laid on clean energy and the focus being on harnessing renewables, the demand for Electronics Control Systems Engineers will increase in the utilities, distribution companies, and the independent power producers who would be hiring them. Their role acquires significance as they would have to keep a tab on the grid which will see an influx from the conventional as well as non-conventional source of energy.
Hope this answer helps.
Good luck...

Hello Dhanashree,
It  totally depends on your interest. If you are interested in VLSI, Signal Processing, Communication or Electronics. And another aspect is that whether you want to go for a teaching profession or into your core industry or you want to go for further research. If you want to go into teaching or research, please choose according to your interest.
If you want to apply for your core industries post completing your degree, then I would suggest go for M.TECH-VLSI, because VLSI jobs are more in the market than other specializations.
Hope the answer helps.
Good luck...