Who is better at calligraphy, Su Shi or Mi Fei?

Su Huang Camouflage, everyone in Song Dynasty, Su Shi was the first, and Mi Fei was the third. Judging from the handed down works, Su Shi's Cold Food Sticker is called the third running script in the world, and it is also called the third running script in the world together with Preface to Lanting. However, for art, it is difficult to have an evaluation standard, only to see everyone's preference for these two, the so-called literature is no first weapon and no second.