When considering a post-graduate program in management, it is important to gather information about various factors that can impact your education and career opportunities. These include the brand value of the institute, the exposure and opportunities provided by the institute's location and academic record, the brands that come for placements, and the placement figures with respect to different specializations like marketing, finance, HR, etc. In this context, Welingkar Mumbai and BIMTECH Greater Noida are both strong options to consider. 

Firstly, Welingkar Mumbai is a well-established and well-known brand in the market, with a long-standing history since the early 1990s. BIMTECH Greater Noida, on the other hand, has gained popularity in recent years, becoming a brand after it performed well after the global recession of 2009.

Secondly, studying in the financial capital of India, Mumbai, provides students with valuable exposure and opportunities. However, this does not limit the placement performance of Welingkar with respect to marketing specializations, as it provides very good placements around 8 lakh rupees per annum CTC.

Thirdly, when considering ranking, Welingkar Mumbai is among the top 30 institutes in India, whereas BIMTECH is among the top 45. Therefore, it can be concluded that BIMTECH is a good management institute for marketing placement, but Welingkar Mumbai may be a better overall option due to its established brand and reputation.

However, it is important to keep in mind that these are not the only factors to consider when making a decision and it is important to conduct thorough research and evaluate all options before making a final decision.