I’m from California, been on various trips around Spain, and France, with under a week spent in both Italy and Switzerland.
I love everywhere I’ve been. I’d be happy to live somewhere in western Europe.
I don’t know if European healthcare is better, but it’s far more civilized in its availability. I haven’t seen much difference between EU and USA for equivalent-quality grocery prices, with the exception of Zurich. I’ve found Europe to be generally safe. There seems to be more “sneaky” crime, whereas the States has more confrontational crime.
Freeway etiquette is far better in France and Spain than California. Trains, of course, are better too.
One major difference is labor laws. The EU has far more protection, but far less mobility. I remember telling a German friend that I had gotten a new job operating a fairly large power system, after working in a tangentially related field, without any additional study or licenses, and his response was “Only in America!” I hadn’t even considered that this move would be far more difficult in other countries.