Was doing some searching on the forums for something else and this thread came up.
The Astute v Virginia question was answered in 2012.
The winner being HMS Astute.
During the exercises HMS Astute Commanded by Cdr Iain Breckenridge (formerly CO of HMS Tireless & XO on HMS Superb) had many American dignitaries onboard.
Quote:
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Our sonar is fantastic and I have never before experienced holding a submarine at the range we were holding USS New Mexico. The Americans were utterly taken aback, blown away with what they were seeing.
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https://www.gov.uk/government/news/hms-astute-arrives-home-from-us-sea-trials--2#:~:text=She%20'battled'%20against%20USS%20New,16 %2C400%20miles%20(26%2C400km).