It depends on your choice which field you want to choose.All the three are very good and have wide scope.
CS course generally deals with corporate law.
CWA course basically deals with cost accounting.
CMA course deals with cost and management accounting.
So final decision is yours in which field you want to go.

If you are interested in cost accounting then go for ICWA and if you are interested in company law then go for CS. And for advance accounting go for CMA.. All depends on your personal choice as all the options are pretty good for future.