Superb network in metropolitan cities while a fluctuating slow network while travelling.
For frequent travellers like me, Airtel stands nowhere.
I prefer reliance 4g with Mi-Fi. Awesome speed, constant speed, much less fluctuations, and available in remote areas too.
Trust me bro - Airtel ads which claim to provide services at rural areas is total fake. Even technically too its fake coz they dont have so many installations of base tx stations.