White Mountains Insurance (NYSE: WTM) has a lot in common with Warren Buffett-led Berkshire Hathaway (NYSE: BRK-A) (NYSE: BRK-B). The company's insurance-based businesses have fueled the company's investment portfolio, to name the key similarity. However, there are some big differences investors should be aware of before adding White Mountains to their portfolios.A full transcript follows the video.Continue reading