According to ONE, who would win in a fight between Tatsumaki and Mob?
In the One Punch Man Wiki at the Tatsumaki page, it is stated :


  ONE has said that Tatsumaki is stronger than 100% Mob, the protagonist of ONE's other work, Mob Psycho 100, but against ???% Mob, there's no answer.


Still according to One Punch Man Wiki, ONE said this during  his Niconico interview.