Career is a result of your work interest. Your interest in a particular field drives you to take up jobs and related professional courses. Having that said, if you think Accounting and auditing is your cup of tea, there no better course than US CPA. It is like having a black-belt in accounting, provided by the biggest accounting body on the face of Earth – the AICPA (American Institute of Certified Public Accountants)! On the other hand, if you’re interested in stocks and investment instruments, risks, and portfolio management, then CFA would be the right course to pursue.
Its solely depends upon your interests and preferences. What you want after 5 years down the line. Because in CPA, the more emphasis is on Accountancy and Auditing and Taxation of particular province for which you have been registered for CPA.
However in case of CFA, it is more of core finance field. As a being CFAI candidate, I can say that CFA focuses on the following areas:
Fixed Income and derivatives
Professional ethics (in respect of Investment Industry)