Pat,
Agree with TD. Clubhouses are best from 12 noon to 6P if you visualize the site as a clock face, for sun reasons.
I always wondered why Ross had so many corner clubhouse sites. If you think where the area was developed and where the utilities probably were, it was a frugal, common sense thing to put them where he put them. Also, saved the cost of a long entry road, which is rarely necessary unless its a 36 hole course, or part of a housing tract. Lastly, if you think about golfer circulation, it is most logical to go from the road, to parking, to clubhouse to first tee. It is usually, not always, a small irritation to have some other arrangement. All in addition to Tom's point of not having to hide them from a 360 degree view inside the course. And, up north, to avoid the super having to plow his way in during winter.
As to what is easier, frankly, while TD and a few others once wrote about designing the golf course first without regard to the CH location, I rarely have had the luxury of unlimited clubhouse sites. For reasons mentioned above, it usually comes down to just one or a few logical locations. I hate to spend a million or more of the owners budget just to get to some ideal clubhouse site, but once in a while, it is the preferred design, just not often. I would rather keep it for the golf course.
So, most of the time, I do end up siting the clubhouse first.