This is my first experience with domestic India airlines. I'm flying one-way from DEL-COK in December. I see two non-stops: one on 9W (7011) and the other is S2 (255), same times, same equipment, different prices. Are these the same flight? (I suspect so, operated by S2, but I'm not sure.)

Also, I've checked several online booking sites (jetlite & jetairways, as well as makemytrip, jatra, ixiggo). Is there any reason to prefer or avoid one over the other, except the lowest cost?