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The main work which lays the foundation of Marxism is not the Communist Manifesto. It is the many-volume theoretic work which is called Capital (Das Kapital) by Marx alone. The Manifesto is just a short pamphlet, stating the main conclusions. In the Capital, Marx developed an economic theory, from which he concluded the inevitability of the development of society towards communism.
Many later socialists recognize the analysis given in Capital, though not all subscribe to the statements in the Communist manifesto.
Engels never positioned himself as a leader of the Communist movement. He just supported Marx (especially financially) and wrote several books promoting Marx's views..
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Marx's Das Kapital is a bourgeois theoretical work aimed at working class readers, but functionally aimed at bourgeois readers with left liberal sympathies hostile to the right liberal trajectory of ostensibly socialist parties in the 1800s: Marx, Critique of the Gotha Programme.
In contrast Engels spent his time on historically specific analyses such as Condition of the Working Class in England 1848, Peasants War in Germany, or Family Private Property and the State.
It is a truism that Engels as a bourgeois party boi wrote better works about actual existing working class life, and his work about theory (Anti-Duhring) you would use dog shit to wipe off your shoe.
Marx, the apposite.
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It is worth adding that the official Soviet propaganda treated Marx, Engels and Lenin as equals all up to the end of the USSR, as manifested, e.g., by the canonical images featuring all three of them, which were hanged all over the country in the run ups to the Revolution day or May 1st (image source):
On the other hand, the official ideology was referred to as Marxism-Leninism, stressing that most theoretical developments owed to these two.