Hello Pushpa, your question is very conflicting since Computer Science engineering is a totally different field and has no relation to Chartered Accountants. A science graduate can although be eligible for both but a commerce student has no eligibility of Computer Science Engineering. 

However from a commerce point of view CA (Chartered Accountant) and CS (Cost Accountant) are similar parallel fields a commerce graduate or someone interested in finances can go for. If you are good in Accounts, CA is definitely a better option for you to pursue post graduation. 

Hello aspirant,

The CS acts as a primary source of communication between the company and its shareholders, such as taking and distributing minute from shareholder meetings.

Chartered Accountants provide accounting services for clients in either the public or private sector. Their areas of study and expertise include auditing, taxation, financial reporting, and business/managerial accounting. 

Both credentials offer different opportunities, but in most cases a CA can do everything that a CS can do. Thus, if you are going to get one certification, you are better off just becoming a chartered accountant. If you are good with accounts i'll suggest you go with CA. But the ultimate choice is yours.

Best of luck!!