Key PointsBerkshire Hathaway’s total returns since going public are skewed by strong returns early on, before most investors would have been interested.Nevertheless, Warren Buffett’s approach to managing the conglomerate and picking its stocks remains as productive as ever.Even as good as Buffett and his successor are, both chief executives rely on this one factor to do most of the heavy lifting.10 stocks we like better than Berkshire Hathaway ›…