Garland,
I simply believe that the course setup over the years at ANGC has produced much more exciting tournaments and much more interesting play than the grind-it-out US Open.
Of course, with the continued lengthening and tightening of ANGC I fear they are going to sqeeze the fun and interest out of it.
It also seems that generally The Open and Masters seem to identify the best players, although that may be changing (at least at The Open) for some inexplicable reason.
I also think that many of the courses that have hosted the US Open in my lifetime have not been to the stature of ANGC architecturally...to wit, see Olympia Fields, Medinah, Inverness, Winged Foot East, Congressional, Atlanta Athletic Club, Hazeltine, et.al.