US healthcare moves much faster and turnaround to getting a new appointment with a specialist is a fraction of the time in the UK (NHS only).
My SO had a personal health issue that she attempted to get help for in the UK. She had to wait months for a GP appointment with the NHS, only to be told "let's monitor the issue" instead of actually doing anything. We went home to the US (making an appointment <2w in advance) and we saw a doctor who immediately found the underlying issue and had it fixed.
I could go on about the health system in the UK...
edit: Ha even the article talks about this! "I am in the system for NHS treatment, but things are so bad that I have not even received an inital letter with a date for a test. It would likely take up to year for the NHS to treat me."