There are two interpretations I can perceive to your question.
If you are looking for an MBA degree specialized in Operations Management, NITIE, Mumbai and SIOM, Nashik are the unparalleled best ones. NITIE undoubtedly has the best rankings, campus and placements, and is the king in the league. SIOM, under the prestigious Symbiosis International University, has an extra edge with its well laid out syllabus and set of certifications. The college is not very behind NITIE in placements either.
If you are looking out for a general MBA degree with a specialization in Operations, SP Jain, Mumbai should be a very good choice. Among the IIMs, IIM-Calcutta, IIM-Ahmedabad and IIM-Lucknow are known for their Operations. The Operations specialization in IIM Ranchi, IIT-Bombay, IIT-Delhi, MNIMS-Mumbai and IIT-Kharagpur are also equally good and rewarding.
All the best :)