Now that my Pygame GUI comparison is AFAIK complete, and because this comparison accounts for a significant amount of incoming traffic, I am providing a consolidated index to all of the blog posts here on the Pitchers Duel blog regarding this GUI evaluation.
The original comparison scope with Photoshop-drawn interface image .
The GUI comparison Summary

PGU GUI Example updated (code)
PGU GUI Example (code)

Ocemp GUI Example Updated (code)
Ocemp GUI Example (code)

Poutine GUI Example (code)

Mike Leonhard’s GUI Example (code)