Join Date: Feb 2003
Location: Alexandria, VA - DCA
Programs: BA Gold, American Airlines, Marriott Plat, Hilton Diamond, IHG Diamond
Posts: 5,075
PHL is a relatively major city; PIT is not. The O&D combined with the connects is what makes PHL the hub.
That's your answer despite where all the individual preferences may wish/hope/remember/dream/want.