If 15 lacs you were going to spend anyways(not manufactured), then IndusInd explorer is better as you get 5 Business tickets. If your spends are lower, then getting Atlas/SBI VP/Axis Vistara signature is better, as the ROI is good. If spending on utility/insurance/govt spends - better check first how much cv points you get with each card and then get that.
Also if you are fine with Prem economy, a combination of SBI VP, Axis Vistara signature, IDFC Vistara could also be done.