Such 'tops' will vary slightly according the criteria. See e.g. Freedom House's or V-Dem's "Freedom of expression index, 2022":
TBH, I'm not sure the small differences in index values above 0.9 are all that important. (Yeah, V-Dem does not rank the US the first, contrary to what you expect.)
For the former (FH), I could not find a ready-made map that separated the freedom of expression from the rest of their freedom index, alas. (Perhaps someone else can contribute that.) FH probably ranks the US higher on expression alone because FH is US based. V-Dem in contrast is Sweden-based, so they probably don't consider anti-hate speech laws a significant issue. There used to be a separate FH freedom of the press report/index, but that was discontinued in 2017, it seems. Anyhow, while the methodology of that had separate sub-scores e.g. for legal, political, and economic environment [of press independence], that level of detail appears absent in the final report on a per-country basis.
The only country that gurantees unlimited free speech (in some sense), as far as I know, is the United States.
While people alive today might not remember or know, this isn't as much as a result of what the constitution says, but how it was interpreted. In the interwar period the courts judged that the "bad tendency test" was adequate, and it favored government-imposed restrictions quite a bit. Only in later times did that legal doctrine get replaced with one that elevated freedom of speech above other competing issues (by coming up with a "hierarchical ordering of constitutional rights").
Also, the subjective perception on the freedom of speech in their own country varies quite a bit (relative to those indexes):
So, whether people consider hate speech as necessary for freedom, YMMV. Anyhow, on such polls, the US does rank highest (overall) when people are asked what kind of statement should be protected, but not uniformly in all categories (although it was pretty close to the top in most):
The USCIRF does regularly rank countries by one of those categories: blasphemy laws (or lack thereof) and whether they were enforced recently.
Also somewhat related (the history of) such laws in the US, on Wikipedia. Until the 1st Amendment started to be applied to states & local authorities (in the 20th century) those were not unheard of in the US either.
As for hate-speech in the EU, there were some "hold outs", e.g. in 2020 it was reported that:
The European Commission has started infringement proceedings against Estonia, since the state hasn't enacted criminal legislation against hate speech.
According to the text, the other country was apparently Romania. (Not clear if infringement procedure was started against Romania. Romania apparently complied in 2022. And apparently Estonia too in 2023.)