Moka Pots don't make espresso.. But they DO make a tasty, strong brew of coffee.
Keep in mind, Espresso is a brewing method, nothing more. Its not a blend of coffee*, or a roast level.
There ARE espresso blends, but they dont HAVE to be used for espresso. Ive brewed espresso blends many times.
For the Moka pot, you can use whatever coffee you like. Whether it be light roasted or super dark roasted, a blend of coffees, or a single origin, or a blend a roaster sells for espresso. For an espresso machine, you can do the same thing. Light/dark roast, blend/single origin.. whatever you like.