Unemployment rates
US 4.3% (July 2017), 4.1% (Oct 2017)
UK 4.2% (July 2017)
Of course these numbers will vary greatly by state and city. Traffic of course depends on where you live.
From an article in the Telegraph, Oct 20, 2017, entitled “London now more dangerous than New York City, crime stats suggest” states that crime is up 13% across the UK.
“While both London and New York have populations of around 8 million, figures suggest you are almost six times more likely to be burgled in the British capital than in the US city, and one and a half times more likely to fall victim to a robbery. London has almost three times the number of reported rapes and while the murder rate in New York remains higher, the gap is narrowing dramatically.”
As far as criminal injustice, a google search will come up with many examples of wrongful convictions and bias in the UK, including a recent government report on the bias against minorities within the criminal justice system. Human-made justice systems are as fallible and corruptible as humans are.