Better Warren Buffett Stock: Visa vs. American Express

Warren Buffett watchers know that American Express (AXP -0.68%) is one the investing legend's favorite stocks. It's been a part of the Berkshire Hathaway portfolio for 30 years, and today it's the second-largest position behind Apple, accounting for 15.2% of the total. Berkshire Hathaway owns 21.5% of American Express' outstanding shares, signifying his confidence in the company.Buffett loves financial stocks. He's a big believer in companies that play a large role in the economy, and financial infrastructu ...