But fundamentally, what I want most is to be somewhere my kids can ride bikes or walk alone to school, to friends, to the shop, etc. from the age of 7 or so. As best I can tell that pretty much means the Netherlands, parts of Denmark, or perhaps Japan (more for transit than cycling).
Children can't drive, which means unless you're lucky enough to live very close to your friends, and ideally on the same side of the street, your home is effectively your prison in the US and Canada.
And yes, I suppose you _can_ let your kid ride a bike to school alone in the US at 7, but you would be risking arrest, and death. It's often forgotten that drivers are, by far, the leading killers of children. Far more than people with guns. I was an avid cyclist in the US for the first 30 years of my life and I still have a bruised rib and too many memories of very, very close calls with death.
NotJustBikes, who moved from Canadian suburbia to the Netherlands, explores this in more depth at https://www.youtube.com/watch?v=ul_xzyCDT98