I'm Canadian, now living in the US, and I'll be honest: for the first couple of years, where I had some medium sized health issues, the US system felt so much better. The hospital I was treated at was leagues better than anything I saw in Canada. The amount I had to pay on my paychecks was lower than the complementary insurance I had in Canada. I had dental insurance everywhere I worked! My teeth are a trainwreck from the years I didn't have access to good dental insurance).
So if someone was to dig in my old social media posts, they'd see my old stance of "I would prefer universal healthcare because its more fair, but if I was only thinking about myself, the US system is better".
Then, as anyone who knows better could have predicted, it went downhill and I was proven wrong. If you have something that's hard to diagnose, the insurance starts fighting against you/your provider to get lesser care (eg: getting a full sleep study is super hard because insurance companies will just want you to take a cheap at home sleep apnea test. If you have a sleep disorder that's not sleep apnea, good fucking luck).
Some providers will not talk to you if they're not in contract with your insurance. Good luck getting behavioral health care. Lots of clinics are in bed with very specific insurance, and will not even take self pay. So you have to call 15 of them because even the ones on your insurer's website may not want to speak with you.
The paperwork. Holy shit the paperwork. I had surgery once, and I was still getting bills for it 6 months later. SO MANY BILLS. Some of them were absolute bullshit, but who has time to call insurance and hospitals over and over and over to fight every single one when there's douzens for a single procedure. So I just paid the co-insurance fees and suck it up. I never had a way to tell when I was getting "the last bill".
In the end, I'm reasonably well off, and I have pretty much the best insurance one can have (no deductible, no employee contribution on paycheck, covers virtually everything), and it's STILL a pain in the ass. A pain enough that I've offered some providers to just pay cash to avoid the bullshit. THEY SAID NO and sent me on my way.
Oh, and if I want to start a business, work for a pre-seed startup, or just want to take some time between jobs, I need to coordinate with my significant other to make sure they are not planning on quitting any time soon so we don't have to deal with COBRA or worse.
Yeah, give me the Canadian system any day now.