Don't leave us in suspense! Elaborate.
There are also other differences too, things like many more walkable cities, more modern infrastructure and public transit. I could go on.
Like I'm doing fine enough here but I wouldn't even kind of defend how we live over here. America is in many ways the international version of a person who makes a lot of money but is still check to check eating ramen most nights and playing video games because they spend it all on their hobbies and stuff. It's a way to live but I wouldn't call it a good one.
Also, UK doctors are compensated at internationally competitive rates when compared to average national income, especially so if they work in private practice in London with international clients.
I stayed in apartments in China and Italy where things worked and I never heard my neighbors. I could live with that. But now I live in a house in the US and I'm much happier for it.
* Different people value different things: am I better or worse off when I live in a small apartment in a city and go everywhere by bike/bus while my children cycle to the local public school themselves vs owning a big house with a big garden and a big car, driving them to school every day? Even to what extend such different lifestyles are by choice or necessity are hard to tell.
* Quality of life differences can be very different for different segments of the population (high vs low income, minorities, children, retirees, people with disabilities, etc). Is a country better or worse of when the QoL is a bit worse for a bottom quartile high school drop-out, but a bit better for a a top-quartile doctor, or a third quartile nurse or police officer?
Such questions can't be answered, because they depend mostly on subjective weights.