The main difference between speech restrictions is enforcement and repercussions. Speech restrictions exist in both US and EU. However in Europe no law I know off is insane enough to deem speech=material support of terrorism (unlike US Supreme Court).
Also, EU does not have law allowing military to arrest and detain citizens without due process or even charges, let alone for indefinite length of time.
Any US citizen who wants to test limits of their freedom could use their credit card to contribute 10USD to Wikileaks, see which government list you end up on.
In US it is also against Corporate inetrnal regulations to engage in political speech at work (for citizens) , however employers do it in such an invasive way it is borderline SouthPark. When my friend worked for Illy Lilly in NYC she would forward me Illy Lilly's Republican propaganda e-mails that she would receive with annoying regularity. The e-mails were fucking total BS about jobcreators and how we should all be grateful and vote for our benefactors in REP party.