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Not all satellite systems are equal:

https://www.bloomberg.com/news/articles/2023-09-20/russia-s-...

>The US constellation isn’t as accurate as the newer networks, said Roberts, the Sydney-based professor. “It used to be GPS was out in front,” he said. Now, though, the EU’s Galileo is in the lead, with China’s BeiDou close behind, he said.

It's basically Galileo > BeiDou > GPS >>> GLONASS.

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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.

And frankly accuracy does not matter.

for navigation using Code method GPS-tier is basically good enough.

for precise measurement you use phase measurement of the signal, and what you care about is good(low) DoP of constellation and amount of satellites within sight-line - not from which system they come(to oversimplfy it a bit)

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