The most popular stones for kitchen worktops are Granite and Quartz. They are sold and made everywhere, including the UK. There are some quality companies like Y&S Marble that offer Granite, Quartz and Marble. Or you can go with a company like Classic Quartz Stone that specializes in Quartz. Another great alternative that offers all kinds of worktop stones is Surfaceco. You can't go wrong if you get Granite or Quartz from any of these companies. Now to the point, the pros and cons of Granite vs Quartz:
