Quit on my second playthrough of Catherine.
The story is exactly, EXACTLY the same regardless of what you do. All the meter changes are Vincent's inner thoughts, but those don't affect his actions.
We'll watch the other 7 endings on Youtube; I'm not doing the rest of this thing for that.
The only things you can change in the plot are...
- Which girl flips out before you reach The Cathedral
- Which girl you end up with
- Which ending you get
- Which, if any, of the other people survive the nightmares
You also get special scenes if you complete all of Babel, as well as if you finish Rapunzel after getting all the rosaries.
Thankfully you can skip any tower segment you have gotten a Gold on, which makes subsequent playthroughs easier.