Earlier quoted context omitted.
Puerto Rico would avoid federal taxes. But I don't think the OP should be making this choice based on taxes.
A citizen of the US can't avoid federal taxes anywhere
https://www.forbes.com/sites/robertwood/2019/09/09/move-to-p...
(Despite saying "not exactly" in the title, it is in fact exactly that. Read the details. PR residents don't pay federal income tax. There's just some caveats if you're trying to move there as a tax dodge.)