Jay:
Both are supreme tests of golf -- clearly what the USGA wants to determine a national champion.
In my mind, Oakmont gets the better of the two -- I'd weigh in likely with a 7-3 split in favor of the Western Pennsy layout. Keep in mind I would personally place Oakmont among my top five courses in all of the USA.
Better overall terrain, more unique routing, greater diversity of holes and the slightest of edges on the dimensions and demands of the putting surfaces. As good as the opening and closing holes are at WF / West -- Oakmont has the advantage there as well.