Their is not good volume in the pair of BTC/INR but in the terms of buying bitcoin from INR through directly your bank account then Wazirx is the best option.
Don't trade in INR pairs on the WazirX exchange. They are not liquid and you cannot get them transferred to your local bank. Use the USDT pairs for exchanging and then head to P2P to get your USDT exchanged into fiat or vice versa.