I prefer Marcel DuChamp, mainly because his Nude Descending A Staircase (http://www.art.com/asp/sp-asp/_/ui--275CE7F02DB9454399CF5A260D06620D/PD--10078232/sOrig--CRT/sOrigId--20/Nude_Descending_a_Staircase_No_2.htm) brought a lot of criticism from the Surrealists. (Because it contained a human form, that's why.)

And I like his Found Objects art, especially his second-hand urinal, signed by 'R Mutt' and presented as a drinking fountain.