Depends on the location. Where I live, outskirts of Calcutta, Vodafone I have found is the most solid network thus far. And I have used Jio as my main SIM for over a year, then changed to airtel. Now I am using Vodafone, for around 2-3 months, and its the only connection where thus far I never had call someone twice, which was never the case with Jio. Often times I had to disconnect the call and redial with Jio, as receiver's no. won't connect or whatever. And I don't even wanna mention how airtel was. I mean back in 2008-09 we used to make fun of BSNL (CellOne) mobile connection, but airtel's coverage over here is not even believable any more! Dafuk happened to them God knows!So my (alternate no.) Jio plan was expiring and I have some traveling upcoming, and i'm not sure about jio's roaming where i'm going, so decided to recharge my vodafone instead of porting to jio. big mistake.
even though i got a similar plan as jio on special 121 offer, Rs. 398 with 1.4gb/day 84 days (regular price Rs. 458), although the 'unlimited' calling is FU'd to 250 mins/day or 1000 mins/week. Still thought it would be enough for my use. Well, network coverage/signal strength has gone to shit, 4g speeds i dunno if i should call it even 2g, leave alone 3g. Lucky to get 1mbps where earlier i was getting 20mbps. Oh and volte doesn't work. I spent 20 mins on hold till a CC executive was connected, and the dude was clueless. He registered a complaint. Later I got an sms "we have activated your volte" but it still isn't working.
Vodafone at least, is finished.
So I am keeping my Vodafone, just recharged same as you, 399 for 84 days, though only 1 GB data per day instead of 1.4 GB, and 95% of the daily data is wasted for me anyway, along with all the texts, but the connection is stable AF, so all good there. And yes, VoLTE I don't know about. The phone I use has compatibility for Jio's VoLTE only, so don't know about that. Do miss those clear HD calls of Jio to Jio though.