I'm Canadian so judge my opinion accordingly. If you're employed / well off, the US has a world class healthcare system. Canada's public healthcare is not very good, and we have no real private options. People who can afford to routinely go the the US for tests and treatment. We (canadians) like to gloat about our great system, and maybe it's ok for some things, but bottom line, no matter your personal priorities or ability to pay, you're in the same line for government run services as everyone else. Some people may agree with that, but probably less so when they can't get the help they need.
I know there are lots of insurance shenanigans I'm probably glossing over, but I still wouldn't rule out the US on the grounds of healthcare if you have a good job / career