Why did Tony Leung Chiu Wai's performance in Infernal Affairs overwhelm Andy Lau's performance?

When I saw Tony Leung Chiu Wai hiding in the corner and saluting his dead comrades, I knew that Andy Lau was far behind Tony Leung Chiu Wai. When Liu was young, he could only be handsome and cool. He was always busy and took care of his idol image everywhere, which limited his development. He never challenged himself, and he didn't precipitate himself well, so the role portrayal has always lacked depth. In contrast, the late Aaron Kwok surpassed him in acting. In a word, a first-rate idol, a second-rate singer and a third-rate actor.