Roger,
In as much as Ross did many different styles of bunkers(maybe more appropriately, Ross bunkers were built with many styles), I think there are preferences for different styles. Also, every bunker style has it's pro's and con's. Bogey Hendren decries the frilly-edged bunker(and many times, rightly so), but in reality, it works well both functionally and aesthetically in certain settings. The stereotypical Ross bunker has that same aspect....it works well in certain settings.
Joe