I mean it’s not a paid service , it’s something you throw into CF Workers yourself, so hard to really compare. As far as best in class in the free monitoring landscape, probably HetrixTools has the edge
The result is purely static and the only redirection I make is from / to the welcome page; so using index.html as output would probably be enough to "just werk" with stuff like this or Github Pages/neocities.
Not sure about what you mean by preview, but here's how I do it: build the website, copy the output directory somewhere, run `sed -E -i 's#(href|src)=("?)/#\1=\2file:///absolute/path/to/dst/#g' dst/*/*.html` and open a page as file in my web browser.