Berkshire Hathaway stock has wildly outperformed the market over these past few decades, delivering a total gain of 5,502,284% in per-share market value vs. 39,054% for the S&P 500. But at least one stock that the broader investing community and Warren Buffett can agree upon is Amazon (NASDAQ: AMZN). The classic moatThere are several features Buffett loves in a great stock, and one of them is a moat. Amazon's size and name give it a competitive edge, so even though it's not the classic Buffett stock, it has some clear features that fit the mold. It hasn't reported the number of Prime members it has in a while, but it's estimated at 220 million to 240 million.