I keep hearing that SQ is the best airline. But does that apply for all classes? I wanted to try out some more airlines, so I'm wondering what classes you think SQ is the best at. Which classes you think another airline wins?

So for Economy, Business, First and Suites (ignoring PY on purpose), which do you think SQ is the best airline, and for which do you prefer another? Does it depend on the route? I personally have PPS, but let's assume good status with any airline in question if it makes a difference.