Fast-casual giant Chipotle Mexican Grill has been a huge success for investors, while Cava is still in the early growth phase of its life.Chipotle Mexican Grill (CMG 2.29%) has been a massive success as a business and as an investment. Shares of the fast-casual restaurant chain have gained over 5,000% since the stock's initial public offering!Newcomer Cava Group (CAVA 3.29%), which serves up Mediterranean fare, has only been public since mid-2023 and its stock price has advanced around 80% or so, but that's ...