Marcel Duchamp and Gerhard Richter are two very different artists in different eras and styles. It is subjective to compare their influence can be subjective. 

Marcel Duchamp was a French-American artist born in 1887. He is widely regarded as one of the most important artists of the 20th century. He is best known for his readymades, ordinary objects that selected and presented as art. For example, his famous works Fountain, a urinal that he signed with a pseudonym and submitted to an art exhibition. 

Gerhard Richteris a German painter born in 1932. He is one of the most prominent artists today. Richter's work spans a variety of styles, including photorealism, abstract expressionism, and minimalism. 

Although Marcel Duchamp may have more media coverage than Gerhard Richter. It is up to you to decide which artist is more influential.
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