Originally Posted by
PVDtoDEL
Air India is the full service carrier out of your choices, SpiceJet (SG) and IndiGo (6E) are both LCCs.
I personally prefer AI over 6E and SG, but opinions will vary. If you want the FSC experience (meal, jetbridge, IFE), then AI is your choice. If you don't really care about the FSC experience, then price and schedule are probably the best factors to consider...
reliability wise (on-time) 6E comes on tops.
btw, you did not specify if you need business or economy seats.