Hi, I'm based out of Delhi and my home airport is IGI, New Delhi. My travels include at least 2 return trips from Vancouver, around 5-10 domestic roundtrips and about 1-2 roundtrips to NYC and Hong Kong. I usually fly economy but do select business when there is a good fare available (for e.g. 4/12 of my last year-round trips were in business). I usually try to find cheap fares and do not really stick to airlines but for the past few years my travel has been predominantly been through Vistara, Qatar and Cathay. Which frequent flyer programme would you advice I should enroll in?

Thank you so much!