As per my suggestion with CS you should go for LL.B. to grab top opportunities at management level. LL.B. is a very good combination with CS as far as course content and understanding the corporate environment is concerned.
If you are having LL.B. qualification then it would be counted as an additional advantage and you can easily and confidently handle or administer Legal work/department along with the secretarial work/department. Later on you may be designated as legal and secretarial head.
This advice is based on my professional experience. Hope this would be off some help. Other courses are also good. But my vote goes for LL.B.