I am using vodafone and reliance for last three years, vodafone network is not good, most of the time they always network failure, it have more costly when we think about reliance and airtel. So I advise you to friends avoid void unless its have good network and economically to all user.
Best the connection according to network and service condition.
1) Airtel
2) Idea
3) Reliance
Best connection according to economically
1) Reliace
2) Airtel
3) Idea
I advise you friends not to use vodafone, its have many massages failure problem. Dont thik about international brand, think about what is best for you, your family, and your friends if they all are using vodafone or not