According to Osho, there is no intrinsic hierarchy in knowledge; 'supreme' means whatever knowing and practice liberate you. Many paths—devotion, wisdom, action—are equally valid in themselves, but only one will fit your unique nature. Ranking arises from partisanship and standpoint. Discovering the path that actualizes your freedom is discovering the supreme—for you, not universally.
There isn’t one “best” knowledge for everyone—the best is whatever helps you become free and whole.