Mr. Wolfe,
I concur regarding Saguaro. However, I don't feel that Cholla should be in the category as "any" four hole stretch being the best in the world. Saguaro, for me, was a continuation of the modern return to old school playability and fun with strategic interest. C&C did a remarkable job of including features that challenged me from the tips, but remained fun for the aging German couple that I played with that day. I thoroughly enjoyed the 6-10 stretch of holes and would include it in the top 10 of stretches I have played (yes its five I know). It is a course that defends the "new-old school" architectural model--using width, lots of short grass around greens, and undulated putting surfaces--with vigor.
Cholla however, for me, played a lot like many of the new upscale daily fee courses in the 1990-present genre. It was tougher no doubt. I understand that appeal. But I doubt "Mr. and Mrs. Aging German expat living in Phoenix" enjoy Cholla near as much as Saguaro. I played Cholla in EXACTLY the same score as Saguaro--by the way--in case if you were wondering if I was jaded by how tough it was.