B.Sc Company Secretary

In terms of salary just after B.Sc, they are almost equivalent. But in my opinion CS definitely has the edge because of wider range of opportunities and job available. With CS you can also enter into the highly lucrative area of data mining (salaries in crores if you go abroad). You can go for higher education M.Sc PhD. IT graduates also earn a lot (similar to CS) but the problem is many Indian universities don't take IT degree for higher education. Research fields are limited (they are wide of course but I am talking w.r.t. CS). Also thanks to the stigma attached to technical degrees IT B.Tech are more preferred vis. a vis IT B.Sc (same is the case with CS but atleast you can go for M.Tech and make up for that if that causes problem)
As for course work IT is easier. For most part IT and CS courses are similar but CS involves more maths as compared to IT. So if you are a bit uncomfortable with maths, take IT. In the end it's your choice. Hard work and determination can take you to the moon even if you come with an obscure degree like B.Tech in food storage. What I said above was keeping in mind the general trend (the averages). But exceptions are always there.

B.Sc. In Computer Science is an undergraduate course related to the information technology field, therefore, the job opportunity after completing B.Sc. Are mainly in the IT sector. The IT sector in India is expanding rapidly, therefore, there is always a requirement of undergraduates in computer Science in the following fields by the top IT companies in India:
System integrator
Hardware Designer
Logic Designer
Systems Analyst
System Administrator
Computer programmer
Computer Scientist
As regards to your question about which is better M.Sc. In Computer Science or MCA. As per the industry trend, there is a high requirement of MCA. Candidates in the IT industry as compared to M.Sc. In Computer Science. However, this does not mean that you should not consider M.Sc. In Computer Science. It really depends on which field you would like to go for. For example, if you are looking to go in the following fields there is more chance for you with M.Sc. Degree than MCA. Artificial Intelligence
Wireless Communication
information security
VSLI/Embedded Systems
Robotics
You also have the option to apply for lecturer job in government colleges by clearing the UGC NET exam. You should consider M.Sc. If teaching field is your priority. MCA. Is an attractive option if the fields you are interested in are mentioned below because there is a huge scope in these fields with Masters in Computer Applications. Web Development
Software Development
Database Administration
Hardware and Networking.