Which TLD would you use to make a site takedown resistant?
Where would you host it?
For categorization, let's say it's for a niche that is legal in 50% of the world. Which 50 doesn't matter with the exception of the fact that it's illegal in the United States.
(This is purely a thought experiment; I'd be screwed if I actually wanted to do something like this by merit of being an American citizen who still wants to live in the US.)
This assumes that your content is only somewhat controversial. For worse: TLD .is, Hosting at PRQ (hosts NAMBLA, AnonTalk, …), no idea which registrar I'd use.
If people are actively trying to kill you because of what you want to publish, your only options are PRQ or NearlyFreeSpeech. Both can be fully anonymous, i.e. they will host your content without knowing who you are. Payment would be somewhat hard (I wonder whether they would accept mailed-in, sterile bills (though these could be traced)).