What's the difference between Outside Skirt Steak and Inside Skirt Steak?

Glad you ask! 

Outside Skirt Steak is a popular meat cut praised for its rich fat marbling, tenderness and flavor. This is a very favorite cut among Argentinians, who also know it as "entraña". On the other hand, Inside Skirt Steak comes from the flank and is thinner, leaner and narrower than its outside counterpart.