Every specialization has its own value, demand and future. Few give better scope of placement because of its higher application and demand and few dont give the same.
And you can check the specialisation in M.Tech below -
M.Tech specializations in Civil Engineering and their order of preference-
1. Engineering Structures
2. Construction Technology & Management
3. Geotechnical Engineering
4. Transportation Engineering
5. Environmental Engineering
6. Remote Sensing & GIS
7. Water Resource Engineering
8. Offshore Structures
M.Tech specializations in Chemical Engineering and their order of preference-
1. Chemical Engineering
2. Energy Engineering
3. Process Control & Instrumentation
M.Tech specializations in Computer Science and Engineering and their order of preference -
1. Computer Science
2. Information Technology
3. Information Security
4. Software Engineering
5. Distributed Computing
6. Image Processing
M.Tech specializations in Electrical Engineering and their order of preference-
1. Power Electronics & Drives
2. Power Systems Engineering
3. Instrumentation & Control Systems
4. Computer Controlled Industrial Power
M.Tech specializations in Mechanical Engineering and their order of preference-
1. Thermal Engineering
2. Computer Integrated Manufacturing
3. Automobile Engineering
4. Manufacturing Engineering
5. Material Technology
6. Industrial Engineering
7. Product Design and Development
8. Industrial Safety Engineering
M.Tech specializations in Electronics and Communication Engineering (E&CE) and their order of preference-
1. Advanced Communication Systems
2. VLSI System Design
3. Signal Processing
4. Electronic Instrumentation

Electrical and Communications Engineering is a branch of Electrical Engineering. It deals with the application of mathematical and scientific principles to the design and development of electrical and electronic systems and their components which includes electrical power generation systems.

To know in detail, you can go through below article-
http://www.engineering.careers360.com/electrical-and-communications-engineering-0

Good Luck!!!