The only reasonable APS-C advantage is the price.
Which is a very large advantage. At the risk of repeating myself: "A crop camera is the best/only way of optimizing the following combination of attributes (1) lower price, (2) higher frame rate and (3) smaller pixels (i.e., lots of "pixels per feather"). I currently own a 5D3 and 7D both of which were purchased in the last 6 months. (They replaced a 5D and 40D.) The 7D is used almost exclusively outdoors in comparatively good light with longer lenses to photograph things that move rapidly and unexpectedly. The 5D3 is used for everything else."
Notice the word "optimizing"