Which of the two is more knowledgeable: Sheikh Ibn Baz or Sheikh Ibn Uthaymeen?

Both men are guiding imams, and Allah has greatly benefited people through them. Students of knowledge should benefit from their knowledge. Preferring one over the other is not important and brings no benefit. What is befitting is to dedicate oneself to learning sacred knowledge while recognizing the stature of the imams and scholars and showing them reverence.