Kurukshetra University

It is purely based on your interest and the area you wish to work in. The scope of work for a CA is mainly in the field of finance and accounting area whereas MBAs have more diversity to choose from.
There are CAs as well as MBAs who have climbed up the ladder and reached higher positions, though we may say that in certain areas like investment banking, financial consulting or mergers, and acquisitions, an MBA would be preferred than a CA.
On the other hand, there are instances of CAs who have picked new skills while on the job and handled greater responsibilities than someone who has an MBA degree.
There are also CA professionals who apply to international MBA programmes to have a shot at a global career.
So, we can sum up that a lot depends on the nature of your job, the related responsibilities and the learning involved.