Covishield Vs Covaxin: Which is more effective?

In India, two kinds of vaccine doses are being administered on a large scale - Covishield and Covaxin. Here is a graphical explanation showing the efficacy of vaccines. As per research, Covishield is more effective than Covaxin. But the reports also show that Covaxin is 78 percent effective. 

Watch the video to know more.