its depends upon u & and ur MBA specialization if finance ,u can do CA or CMA
now comparing CA & CMA
CA- if u want to get into(or interested in) Auditing , Taxtation , Accounting , set up a Firm(practice) . Down side it takes 3-4 yrs hardcore dedication .
CMA - If u want to be into factory accounting/costing ,management accounting , indirect taxtation , want a govt (PSU )job . downside CMAs dont enjoy CAs like social satus
btw fields like Finance ,MIS ,ERP , SAP,Internal auditing etc are open to both CA & CMA
i dunnu much abt CS
PS: Im am giving basic idea ! guys dont go pro on me :)