I was always more of a fan of Eddie but at this point I'll go with Bill.
At his peak, if we are talking about mainstream status Eddie was a true superstar, there are a only a few comedians if any with that kind of mainstream influence ....Murray was a star too, but not of that caliber.
But overall Murray has had a much more balanced career with a lot great movies ( not necessarlx blockbusters) in different registers... I feel that he is even more appreciated as an actor now than ever...while Murphy ..yes he was so big that he will always be a star but is not the same anymore...