Spills from red wine, dark sauces and oil can discolor your marble. Darker colored marble, like green, black and red, show far fewer stains than lighter, more delicate shades of marble (like white). Before choosing a type of marble for your kitchen, consider your cooking habits, how messy (or clean) your kitchen usually is, and act accordingly.
Before choosing a particular type of marble, ask to see several samples. Hold the samples up to your kitchen cabinets, floors and walls. Look at the samples in different lights and make your choice. Don't pick your counters from a picture, and if possible, look at the samples in the room where they'll be installed.