Here hazelnuts are the most common in plain chocolate, almonds second, and peanuts are somewhat unusual in chocolate except in candy bars (like Snickers or the like) or peanuts covered in cheap chocolate (other nuts tend to be covered in more and better chocolate, somehow peanuts tend to be the cheaper ones). Macadamia are quite expensive here, so they are usually only used in special chocolates. The only standard chocolate thing I've seen with macadamia was the Lindt christmas-spiced chocolate nuts which usually are almonds, but they offer macadamia too sometimes. And even those nuts are not exactly low-priced, more the upper range of supermarket candy.