Hi, 

 Control and instrumentation (C&I) engineers are responsible for designing, developing, installing, managing and maintaining equipment. The job is to make sure that these systems and processes operate effectively, efficiently and safely.

 and So the scope is also high.Instrumentation engineers find work in Process industries (Refineries, Fertilizers, Paper, Power plant, Food processing, chemical etc), Process Automation (Emerson), Factory Automation (Hyundai)

In aerospace - it is a broad branch of study  deals with the study and development of aircraft and spacecraft. And is still developing sector in India and many other countries. But as a developing sector itself, India offers good scope in the aerospace. Aerospace Engineering is a Good choice to enhance the career in the Aviation Industry.

Both the career have bright  and shining future ahead.

The choice is yours, choose the field you are interested into so that you can deliver best of yourself. 

Hope this helped. 

Hello candidate.Both the branches Instrumentation engineering and aerospace engineering are best in their own way.You need to choose which branch is best depending on your interest.There are many opportunities for Instrumentation and control Engineering.It is purely based on your to choose which branch is better.

Hello aspirant, 

Instrumentation engineers are also called control or automation engineers because they design, produce, maintain and repair instruments that control systems, machinery and processing in factories and manufacturing facilities. They may work on an individual instrument or procedure when starting.

Whereas Aerospace engineering is the primary field of engineering concerned with the development of aircraft and spacecraft. It has two major and overlapping branches: aeronautical engineering and astronautical engineering. Avionics engineering is similar, but deals with the electronics side of aerospace engineering.

To know more about Instrumentation and Control Engineering go to,

https://www.careers360.com/instrumentation-and-control-engineering-course

To know more about Aerospace go to below link,

https://www.careers360.com/aerospace-engineering-course

So according to me it solely depends on your interests, both courses are challenging and have huge scope.