Hi Kamal 

Both BCA and BCS are Equally good.

BCS provides education related to computer science. It focuses on principles and use of computers.

Main subjects for BCS are:

Mathematics

Electronics 

Computer programming theory

Statistics

-BCS mainly focuses on fundamentals of computer science including Hardware , software, database, microprocessor etc .

Main motive of this course is to provide sufficient knowledge and skills that would help you channelise your learning in practical sense.

You can have plenty of options after your BCS like: 

Software developer

IT Manager

Website designing

Program Analyst

Software tester etc

- if you choose BCA , then you'll learn everything from basics . If you want to learn computer languages then this course is best for you.

Subjects you'll study in BCA:

Data structures

Calculus

Financial accounting 

Database management

Interpersonal communication

Digital computer fundamentals

Algebra 

You will learn about core terms like computer networks, java , C, C++, visual basics etc.

You will not only learn about computer and IT but also about management, communication etc.  You will develop Various skills like: 

Networking skills

Programming skills

Modern techniques of IT 

If you want both theory and practical skills then BCA is a good option for you. 

Both the courses are good and also it depends on your skills and how you deal with problem solving methods. 

It depends on your interest and potential , both the courses are Career oriented if you are hardworking and focused.

All The Best!!