I looked this up at http://www.the-numbers.com/people/SLJAC.php and their numbers don't match up. Their domestic box office total is about $5 billion and international box office almost $10 billion. That's for over 55 films, giving him an average domestic gross of just over $60 million per picture and that's including the three Star Wars prequel movies.
Compare this to Stan Lee at http://www.the-numbers.com/people/0SLEE.php. Stan Lee has been in seventeen films for a total domestic box office gross of $3 billion (over $6 billion internationally). Stan Lee's average box office gross domestically is over $191 million.
Of the two, I'd take Stan Lee's record over Samuel L. Jackson's any day.
Stan Lee - 1
Samuel L. Jackson - 0