I think the differentiator is that SE puts a lot more care into the creation of the end product than PG.

I think that’s a little unfair on PG. Their goal is digital preservation, whilst SE’s is readability. We couldn’t do what we do without PG, and there’s (luckily) space for both projects to coexist in a mutually beneficial way. And the reader gets to pick a source that best matches what they’re looking for.