No doubt Airtel is best broad band from all broadband and most of the people in India using Airtel broadband from long. My mobile and television connection is also from airtel. My mobile connection is postpaid and have 4 G network .
When I started using this network it was working awesome but now a days the speed of the network is going down and sometimes gives me 3G and 2G network between 12pm to 1 pm and 7pm to 8:30 pm . I have seen same problem with jio and idea also as some of family members are using jio and idea also. I have contacted airtel also about this issue and they told us that the network is low in our area or may be less tower of Airtel in our area.
So, I think you should also check your area also before buying any broad band because sometimes airtel works pretty good in one of our block and not very good in our area specially for mobile post paid but airtel dish tv connection is very good .
So, its all depend on in which area you are living .