Have you used it extensively by chance? I was recently exploring Pharo with "Pharo by Example", but found it really hard to approach because the UI seems to change every major version (with things like the System Browser changing names). Squeak on the other hand was a lot smoother to get started with. I'm also not really sure how to best compare Squeak and Pharo.

Just scratched the surface, no extensive experience with it. Python is what I use at work, but I miss the Pharo environment a lot. It was forked from Squeak, and indeed still evolves at a fast pace. I think one of the reasons for the fork + name change was to give room for breaking changes from the Smalltalk roots. But it's still mostly compatible.