Too many to judge, so my take (from the white tees) is:
1,2,3 - Merion = by the time you've finished #3, you're really golfing, with opportunities and risks, and all but a couple of clubs used to chase a par of 12 strokes.
4, 5, 6 - Apawamis = a disarming stretch of awkward short irons, small violent greens played in an environmental of craggy, arcane features...and a model of how this entire unique course plays.
7, 8, 9 - Pebble = for what a three hole stretch can be, few could be more pleasing as a matter of golf or human amusement. CC of Fairfield's charming Soundside stretch ending in a fine Redan was a close runner up, but ultimately, that Stillwater Cove and Ocean is too Olympian.
10,11,12 - Augusta National - the steady, gorgeous and exacting descent culminating in the famed Amen Corner and the end of the second act in the drama, Oakmont is close consideration, but is slightly more brutish and cowing to the golf. More than just the acclaim, I think many a golfer longs to play the shots of that ANGC stretch, the slinging tee shot off #10...the risking mid-iron into the 11th green...the sink or swim beauty of the short iron 12th.
13, 14, 15 - Quaker Ridge - like the Ardmore Ave opening three, you're going to play every club in the bag on this troika, with a heavy empasis on the longer irons and fairway metals which can be hit on all three tee shots and are often a neccessity on the perfect strategic beauty of the 14th. ANGC's stretch of 13-15 is also world class in the spirit of the topic, but the Quaker three are a more refined, sublime joy that ought to be sampled.
16, 17 and 18 - Sawgrass...while WFW's and Merions' closers represent the most demanding tests that should finish a day of golf, Sawgrass' have that edgy, exotic note that make the end of the match a thing of zest. If you can get to that 16th tee alive, a spectacular reversal and win is in the offing.
cheers vk