Hello Aspirant! NMIMS is among the top institutions in India offers regular MBA courses although it is not much popular for distance learning program compared to IGNOU, Symbiosis, IMT, ICFAI & SMU. But we would like to say the quality of education is very good.
Just remember that distance learning programs are not very well-accepted by the industry. People consider them as mere certification programs, as such distance learning programs lack the critical elements like engrossed group projects, rigor of the full-time contact programs and peer learning.
So I would suggest that if you can afford please go ahead and do a full time 2 year PGDM program.
Hope this helps.