Astro is very nice, but I kinda feel like they are adding a lot of features I don't want and will never need. It's starting to feel too fancy for SSG. My first time using it I encountered 3 separate bugs with their compiler. The fanciness has a price.
Astro is great, and easily extensible just by looking at the code and existing extensions too. Highly recommend it. Having the islands of actual react stuff is incredibly useful as well.
Astro is great, and is what I prefer on new “static-y” projects (for more dynamic stuff, SvelteKit).
But 11ty really was so much simpler if all you need is to put together some templates, and don’t want to deal with component stuff. That said, the docs really are lacking in some parts.