First, allow me to introduce myself. My name is the Mark Lucas, and this is my first post. I have been lurking at this site for a while, but became a member yesterday. I really enjoy the discussion here about architecture and courses in general.
I have not seen Engh's work, but I have seen Silva's Black Rock - at least before it was grassed. I had the opportunity to walk the site with Brian Silva during construction just prior to seeding, and was able to see all of the shaping, outcroppings, and green and bunker complexes. I thought it had a chance to be a great course. He worked around nearly all outcroppings, leaving them natural. And those that weren't natural, were strategically placed for shot selection.
The pictures of Black Rock (Mass.) looked great. I believe that much of Silva's work is underrated. He definitely has the Raynor flair, and this may turn some off. But having played some of his designs, I believe they are not only thoughtful designs and routings, but innovative and challenging as well.