Final answer:
Leibniz held that this world is the best of all possible worlds and advocated for psychophysical parallelism, differing from Berkeley's idealism and occasionalism's concept of divine intervention.
Step-by-step explanation:
Unlike Berkeley, Leibniz believed that the world is the best of all possible worlds, a position stemming from his principle of sufficient reason and optimism.
Leibniz also introduced the concept of psychophysical parallelism, suggesting a harmony between the mind and the body that was pre-established by God.
This belief contrasts with Berkeley's emphasis on idealism, where only minds and ideas exist, and material substance is unreal outside of perception.
Moreover, whereas occasionalism describes God's intervention in every interaction, Leibniz rejected this, along with interactionism, in favor of a world operating in pre-established harmony without the need for constant divine interference.