Bill G,
Answering with consideration for what it is the Digest list seeks to identify:
I'd agree with Mac that the greens at SH are likely to be more popular with more people, being faster, smoother roll (as at Aug 2012) and less dramatic in contour.
Re: setting, while both Ballyneal and Sand Hills have similar middle-of-nowhere locations, Sand Hills' course being laid out in a massive bowl where a good amount of the course is visible from many points, as well as the numerous long vistas there are both weigh in favour of SH for mine.
I'd also consider Sand Hills more difficult (though in 72 at each I had really similar scores), certainly from tee to green, which the Digest list rewards.
Not sure that equates in my mind to the type of ranking disparity this list features, but I also think that despite the obvious similarities, Sand Hills and Ballyneal are very different golf courses on very different pieces of land.