I will second what Dan has said about the two courses.
The challenges at Ekwanok are more subtle, they hit you over the head with them at Okemo.
Ekwanok enjoys a meadow-like property in one of the most picturesque valleys in New England. Okemo climbs, falls down, and traverses a rather steep mountainside location.
Ekwanok is one of the best courses in the Northeast. Okemo might be the best mountain course in Vermont, destroying the competition in the ski-area related golf arena, as Sugarbush, Haystack, and probably Killington, Stratton and Mt. Snow (haven't seen those last three) most likely aren't as interesting and well-conditioned.
Okemo had some very interesting ideas that I had never seen before, like the building of a few holes directly into the mountainside with ups and downs like they were on flat undulating ground.
As to the comment about public course challenges being overdone, I don't know if that is necessarily the case at all times. It may be here because there are so many of these mountain course choices in VT, Okemo may have needed to distinguish itself in the beginning with conditioning and a slightly newer take on the heavy elevation changes and the thick backwoods that usually border every hole on courses of this type.
Despite the fact that the two courses are as different as can be, they both have some quirk and both require some local knowledge to score!