He’s better than Madlib, Madlib doesn’t have a We Gon Make It, Alchemist has been way more pivotal to rap and his production has been more diverse.
Alchemist doesn't have a Madvillainy.
Otis is a better producer. He has a way more styles that he can tap into. He can do grimy beats, soul, jazz, you name it. Al doesn't step out of his comfort zone. The bulk of his work is the same style repeated.
Saying Al is more diverse than Madlib is straight up lies. Madlib is known for sampling things no one else would even think of using and making bizarre sounds work.