You can pick and choose rights that are important to you and say America is number one. Others can say America is positively lacking in other important aspects. It can easily be argued that America isn't even the best when it comes to protecting freedom of speech, and it's evident with how American-run tech corps police what's permitted on their sites to fit with American laws.
Personally, I found America to be too constricting and the police state overwhelming, and I left for somewhere with more freedom. :)
There is also no argument to be made at all when it comes to speech. America has by far the most extensive and thorough protections for expression and association in the world.
Individuals in America also have much more protection from police interference than in any other country. The 4th, 5th, 6th, 7th and 8th amendments all protect individuals against malicious police actions and prosecutions. There is simply no other country that has anything remotely close to the Bill of Rights.
Additionally, many video games have had to release versions with reduced blood and gore in Germany, due to laws prohibiting the uncensored original versions.
http://www.dorkly.com/post/80945/germany-censorship
There are lots of examples of the German government restricting free expression.
Freedom of speech and art was, indeed, circumvented for games in Germany, but not Austria.
And whether it is such a great thing to allow racist speech without consequences is everybody's guess.
I gave you several cases. Now you have.
https://www.independent.co.uk/news/world/europe/marine-le-pe...
https://en.wikipedia.org/wiki/Laws_against_Holocaust_denial#... -- because apparently if we outlaw Nazi symbolism it will disappear.
France is even more awesome: Gayssot Act makes it illegal to question the existence of crimes against humanity as defined in the London Charter. Let that sink in - it is illegal to question.
But I'm diverting, the starting was a comment stating that the US are having superiour rights in that regard in general. Which is, IMHO, not true and to generalized without concrete examples. Now we do have examples and everbody can make up their own mind.