Heyy Navaljee....

First of here's the main difference between the two : 

• CA : A CA acts as a business advisor by preparing financial reports, helping the business to secure loans, preparing financial projections and determining business viability. As a tax advisor, a CA helps businesses and individuals to comply with tax laws.
• CWA : CWA will maintain and scrutinise statutory books of accounts, prepare cash budgets, cash flow statements, do cost management planning and determine costing policy for companies, besides advising on investment and profit-planning. Good computing skills is a must for rendering services efficiently.

So decide according in which you are comfortable and good at. 

Here is  the link will all details about CA exam : 

https://finance.careers360.com/articles/ca-cpt

To know about detailed difference, salary etc vist below link and then decide accordingly : 

https://finance.careers360.com/articles/3509-CA-CS-ICWA-Evergreen-careers