That would be expected for a system launched 33 years later, but in Galileo and GPS are identical for civilian use (and obviously no-one knows the military capabilities of Block III satellites as that's undisclosed).
GPS+Gailleo is the current SOTA, but it's nonsense to say Galileo is "best".
Galileo has signal authentication, GPS doesn't. In a world where GNSS spoofing is increasingly becoming a hazard to aviation and other applications, that's arguably critical.
Not for civilian use, no, although GPS does for military users.
Also, OSNMA is not SA yet.