What was Picasso's favorite medium?

Picasso has worked with various media throughout his career. During the Rose Period, the Blue Period, Proto-Cubism, and Analytic Cubism, he primarily used oil on canvas. However, during his Synthetic Cubism phase, Picasso incorporated mixed media in his work. For instance, for his Still Life With Chair Caning(1912), he used oil and pasted oilcloth on canvas and surrounded the entire construction with real rope. He also did abstract sculptures, such as his Guitar (1912) made out of sheet metal and wire.