Its true that its quiet expensive nothing to deny on that issue. But if you ask about the service like call quality, network coverage, internet speed etc. There is no match to vodafone with any other network till now. It have its own network not only in India but in entire europe like UK and france. Australia, New Zealand and many other Countries. Vodafone is the one of the largest telecom network in the world. So its upto you now to decide.
And idea and Vodafone are very good opposite of each other so advantages of customers because in Vodafone some Rspich is less compare to idea.
And coverage of Vodafone is everywhere and very good to village area.
And also customers service is not good at all.