According to Engels, Karl Marx was smarter. According to Marx, Karl Marx was smarter. Marx thought he was smarter than everyone else. He even referred to some of his supporters as "useful idiots."
Engels always gave Marx the lion's share of the credit for their philosophical writings. Marx's life work, "Capital", the theoretical foundation of his philosophy was written by him only with some editing help by Engels. "The Communist Manifesto" was written by both of them but it was only a short pamphlet.
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It is difficult to definitively say who was smarter between Karl Marx and Friedrich Engels, as intelligence is subjective and multifaceted. Both Marx and Engels were influential thinkers in the development of Marxist theory, with Marx contributing more to economic and philosophical works while Engels provided practical and literary support. Their collaborative efforts were essential in shaping the communist ideology.