Go for ECE branch.
But there are several options also that you may opt.

1) Go for job-
You can directly do job after diploma if your score is more than 70% along with the deep practical and theoretical knowledge and good communication skills.

• Private Companies-

Wipro
Intel
Cisco
TCS

• Government Companies-

BHEL
ISRO
NTPC
CDAC
ECIL
BSNL

2) Short term courses in-
Embedded Systems
VLSI
Networking(CCNA)
Robotics
SCADA Communication

All the best!!

Hello Nithin,
After completing the diploma course in Industrial electronics you can take ECE (electronics and communication engineering) or EEE ( electrical and electronics engineering) for further studies in Btech. Both are very good with high scope branches of engineering.

Hope this helps you!