Which one should I prefer for pilot training: Pailan Aviation Institute - Kolkata or National Flying Training Institute (NFTI) and why?

I think NFTI is a better option, as it offers good placements like Indigo, which offer good amount of money (INR 30 Lac per annum) in starting.

Clearly, you should prefer NFTI, because Pailan Aviation Institute - Kolkata does not provide Pilot Training at all.

You can take out your own difference. Generally, it depends on both merits and demerits. I would suggest you to take NFTI: NFTI, Gondia: Established in 2007, CAE Oxford Aviation Academy, Gondia, also known as National Flying Training Institute is one of 9 CAE Aviation Academy flight schools around

The clear winner in this comparison is National Flying Training Institute (NFTI).The simple reason being that they have very specialized cadet program of Indigo that offer direct experience. Secondly, Pailan Aviation Institute - Kolkata is known for their courses in Aircraft maintenance engineering