A very good choice, because the Internet Archive is financially far less secure than the Wikimedia Foundation and provides a vital service, by archiving Wikipedia sources before they go offline. This makes sure you can still see in five years' time what someone has cited in an article.
Archive.sth isn't an organization but a private site thus their finances aren't fully known. Based on that, think it like a GitHub project. If you like its work and can, donate.
I think the Internet Archive's insane legal strategy and wishful thinking with their Covid lending library is more than well known enough without me spelling it out explicitly.
They also pay their executives far less.