The 18th at Sleepy Hollow is now one of the best closers around, although as Jim Sullivan asserts, I'm not 100% sure if it plays as long as the 14th at Merion, which is ridiculously long despite modest card yardage.
Nevertheless, of the two holes, I like the one at Sleepy Hollow better, especially now with Gil and George's changes.
The great part of the hole is that unless you frontally challenge the huge bunker on the left, the player is left with a longer, and more intimidating second shot, where the intervening tree and additional bunkers create a minefield of lost hopes for finishing in anything but dismal style.
Also, most strategic trees I've seen on golf courses are left to fend for themselves, and once their gone, the hole is generally neutered and denuted.
In the case of 18 at Sleepy Hollow, the angle of the approach, the slope of the land, and the bunkering scheme employed ensures that the inevitable loss of that big tree on the right is also inevitably a non-issue to the strategic playability of the golf hole.