I think as per market reaserch Vodafone is second biggest netwaork provider in india but for me and for the area I do live there networks are never there. I would like to say that most biggest network of Airtel is also not good in my area but with them they are super bad and it is no service most of in near area.
The vodafone rate is so high before Jio its charges was so high ie 250 rs = 1 GB Now its become 100 rs = 1GB . Also vodafone service is not better because they dont speek in happy mood , its speek in rude mood and also asking for survey
So I do recommend Airtel even after having complaint with Vodafone as they are still the best.