I don’t usually send emails, however, I do reply to the ones sent to me. Regarding the number of seats in each colleges, you may visit the website of each institute or go to sanmacs.com where most of the information regarding MCA admission is available.
Regarding MCA vs MBA, if it is money you are after, then MBA is definitely the better choice. Moreover, MBA is a management course so they will be higher up the organization pyramid. However, if your passion lies in technology and you want to delve deeper in computer education then MCA is better than MBA.
The most important thing is to decide what kind of career you want for yourself and decide accordingly.