Hello Sindrella ,

Robotics is vast field it is not particular to one branch its combination Electronics , Mechanical , Computer Science , Instrumentation . Most demand and have good scope.

Electronics : Electronics can help communication with robot and transfer of data .

Mechanical :  How to design the outer structure and Which material is good to use  and creating Mechanical movements in robot like Walk,run,throw e.t.c.

Computer science : it deals with the software problems  and coding in robot.

Both above fields you mention in question is good.

For more details regarding B.tech in Artificial intelligence go through this link .

https://www.careers360.com/courses/b-tech-in-artificial-intelligence

I think this answer will help you lot.

All the best !!!