Whereas The New Yorker has Malcolm Gladwell, Harper's has Mark Kingwell, and therein hangs the tale.
Somehow they've maintained relevance and stayed in business despite the fact that you still have to be a paying member to view any of their content. If you haven't had the pleasure to playfully browse through their original formatting, treat yourself.
Chris is right on, 1st half is awesome right through the main article and especially the annotation. (and the findings page at the end is great too.) Cons: impossible crossword, arcane book reviews, occasionally a little too cerebral.