It depends a lot on the province/city vs state/city for sure, but having lived most of my life in Canada and now being a US permanent resident, the difference is night and day.
When I was a kid, I was -terrified- of the ER, because I knew I'd be there all fucking days. I had a friend who had a major motorcycle accident, was bleeding everywhere, and beyond stopping the blood, made him wait for hours.
And then there's the huge percentage of population that can't get a family doctor, and even if you have one, getting any kind of appointment can take months.
Since i moved I started having some health issues (probably related to american food, heh), and the first time I walked in an hospital (after I walked straight passed it thinking it was a condo building), I couldn't find the ER because I could not find the crowd/line.
I was seen immediately, and the service was 100x more respectful, and problems were found significantly faster.
Of course, its because of the $$$ involved and I have great insurance. Thats unfair to the poor, and I'd still take the Canadian system over that if only so people don't have to be terrified about going bankrupt because they get sick. But in term of care quality, its literally incomparable. Night and day.