Both are very good, but Sagurao is far superior. Yes, it's true that there may be more to learn about how a flat site can be used at TSN, whereas WKPS is a very good piece of land that could have yielded a good course to many different architects.
Except ... if you're going to only play one ... play the one that's a better course, on better ground, with better views.
Or put it another way. I have specific memories of exactly two holes at TSN. I have very specific memories of every hole at Saguaro.