I have a habit of trying out all the operators.
Have the following active sims:
Jio - Primary
Airtel, BSNL, VI - Secondary
Have found airtel to be better almost everywhere I go, but I don't give them a lot of money since I have had some bad experiences and believe that money and looting in the name of better service is all that matters to them.
7 years back i used to have - Reliance CDMA & GSM, Uninor,
Tata CDMA, Docomo, Videocon, Aircel, Airtel, idea, Vodafone (all active). My experience with Reliance CDMA, Aircel and Docomo was extremely good.