I find Jio costly for the service they provide par the amout. All Addon connections cost 150/month, and base price hike. I have been on Postpaid since begining, and ported out to Airtel last week.
Another reason for this is the International Roaming cost, they charge you 5999 for 30 days, with just 6gb. where airtel provides 12GB for 3999 and fantastic coverage.
The service I got during my frequent Europe trips was below average and I was missing bunch of Incoming calls, and Outgoing worked after multiple attempts.