The carne asada uses skirt steak as the cut of meat.
The cut of meat that is most commonly used for carne asada is skirt steak although flank steak is also sometimes used for carne asada.
You can use whatever cut of meat you want when making carne asada but skirt steak is the most commonly used cut of meat for the carne asada.
The skirt steak cut of meat gives the carne asada a nice flavor.
If you want more tender meat for the carne asada you can use rib eye as the cut of meat but if less tender meat is desired then skirt steak or flank steak would be best to use for the carne asada.