It depends what you're interested in. "Market vs. Usage share" is a debate that rages every time these numbers come out. It's really apples and oranges. For me

It depends what you're interested in. "Market vs. Usage share" is a debate that rages every time these numbers come out. It's really apples and oranges. For me, market share is an interesting piece of trivia and usage share is a snapshot of the zeitgeist of more heavily engaged users. Which one matters most to you as a developer?