Disclaimer: This comparison is from purely a customer perspective & neither airline or any other airline paid for my tickets.

After a long time, I had an opportunity to fly on SpiceJet & IndiGo thanks to the organization who had invited me & booked the tickets.

I flew IndiGo Bombay - Goa whilst Goa - Bombay - Chennai was by SpiceJet whereas Chennai - Bombay was by IndiGo.

The parameters on which I evaluated both of them were Baggage Handling, Check in, Transport, Seats, Service, Food, Flight

Baggage Handling - Both airlines were good, given the fact that space & other restrictions

Check In - SpiceJet was good in Goa, whereas in Bombay was not energetic enough. Allotted seat was different from the one asked for & confirmed. Information about Flight Delay was not forthcoming at both places. And the refrain was “Due to incoming flight coming late”
IndiGo was Perfect from both Bombay & Chennai, polite, seat allocation was perfect & Flight on time both ways.

Transport - The IndiGo buses were new, better, height of step perfect, a great help for those with knee trouble & old people. Another excellent aspect was the stairs to the aircraft, they actually had a ramp instead of stairs - very easy & convenient. SpiceJet buses were nice, but wonder if they were expecting floods everyday, since the height was very much, though in Goa there was a additional wooden step kept that helped. But the stairs, I presume were rental from Airport were horrible.

Seat & Service - Seats were equally good in both, as was inflight service. IndiGo offers water from a Jug in a glass, whilst SpiceJet offers a bottle & though having heard about water being refused a second time, this was not the case at all.

Food - The quality of food was good on both airlines, however IndiGo offered more variety, whilst SpiceJet offered discount if booked along with the ticket, which was a good idea

Flight - This was good on both airlines, with competent crew, aircrafts and all.

IndiGo gets my vote & edges SpiceJet due to On Time flight, small extras such as the bus, ramp which is welcome.