CA

Passing of compaies act 2013 and other laws have increased the work requirements of both areas
In CS it has increased more
They have secretarial audit , due dligence and compliance
Compliance is very lucative field where multiple lakhs are paid for the work of big companies
Hence conclusion CS has more opportunities

CA from India is not accepted in every country so first check from the website. icai.org about the license to practice. Once you obtain the license, it will depend on your experience how much you may earn as every country has different prospects.

Hey S.M.Haries,
Both the courses give you different field to work and scope of your career. If you go for BCA you will have more opportunities than B.Com as it will give you technical knowledge as well as candidature for most of the govt. sector jobs. However B.Com is a good course too if you are good at it you will fetch a job easily. Also effectiveness and career start also depends on the college you are studying. A few good college -

after completion of b.com you can try for MBA through cat,mat,xat,c-mat etc. but for this you have to qualify any one of these exams and you can do cs also along with b.com

It depends on individual's acedmic performance, personality and luck. For MBA institutes from which you pass out is a major factor on your first salary.