M.A

There isn't any university with the name University of Kotak. In order to be eligible to apply for an MBA or Master of Hotel Management, you need to have a Bachelor's degree from a UGC recognised university with at least 50% marks. Your MA does not hold any value for placement and package as it is purely based on the placement the course and institute bring, your academic and your own performance during the campus placement and interview.
Now as far as which one is better, it depends. If you get a seat in top MBA/ PGPM institutes like XLRI, IIM, FMS Delhi, NMIMS, SP Jain, etc. your average package will be 18 Lacs- 20 Lacs per annum. If you do it from a tier-2 institute, the package will be around 10 Lacs, if it is tier-3 then around 4 Lacs PA. With an average placement of 50% institutes.
If you do a Diploma from Institute of Hotel Management, the premier institute in the hotel management, you may expect a monthly package of 15000 to 40000 depending on the role you get.