Airtel and BSNL are the best internet connection. But again, if we compare both Airtel is the best because BSNL you won't get the proper service. Also if you are taking Airtel, they will give you a land phone with no cost.
I am staying in Bangalore and using Airtel Broad Band connection for the past 5 years. Till now, there is no issue with their network. In case, if any issue, call up the customer care. Once you log the case with the Airtel, you will get SMS with all details. They will try to fix immediately through phone support or if it is related to any other stuffs, they will send the person to our home and resolve within the timeframe.
If you are going for data card and you are in Bangalore, the best option is Tata PHOTON. If you are frequent traveler then Reliance net connect is more comfortable.
I am using Airtel Broad Band Internet connection and below is my detail tariff.
Plan – Max 10GB (2Mbps/256Kbps)
Speed – 2Mbps (till 10GB)
After 10GB the speed will come down to 256Kbps. For home usage, I belive 10GB is more than enough.
Please let us know if you any other queries.