Earlier quoted context omitted.
Direction probably. Quora has floundered for nearly 5 years, burned millions of dollars and still has a questionable product. Meanwhile Stack Exchange has been around only a year longer, a fraction of the funding, and pretty well owns the entire question-answer niche.
Stack Exchange owns the question & answer niche? I don't hardly think so. Yahoo Answers, as bad as it is, is massive, and shows up throughout Google's top results; ditto answers.com; and Quora is a top 500 site. Stack has seven sites getting at least 100,000 visits per day. One is a break out homerun (Stack Overflow obviously), and it drastically dwarfs the other sites. All but a few of their top 20+ sites are strict…
What is the Quora engine the best in the world at?
I'd look at growth, too. Even the less popular SE sites grow at very respectable rates. How much is Quora growing?