Outdoor kitchens are a great way to entertain guests and be a part of the party, but when considering building an outdoor kitchen, durability should be the utmost concern. Your outdoor kitchen, unless completely enclosed, will be to be able to withstand all of the elements. Therefore, manufactured stones may not be the best as they could fade overtime with UV exposure. Additionally, porous stones like marble and limestone are more susceptible to spills and the elements.
Granite is a popular option due to its durability, but neutral colors are best as dark stones will absorb the UV rays and be extremely hot for use. It will also need to be resealed at some point, depending on the environment.
Another durable option is soapstone, which is another durable, non-porous option.
Keep in mind, if the space is covered, you will have a greater selection. Nonetheless, an outdoor kitchen is a beautiful way to extend the use of your home.