Long-term tax efficiency, US vs Canada

[sws]

If you have the option of being a fiscal resident in either Canada (as a citizen) or the US (as a GC holder), which would have the lowest long-term tax cost? Income is 100% via self-employment (as a contractor) and (primarily) investment income.

If in Canada, I would likely live in Alberta. If in the US, likely Vermont in the short-term and out west (in a low-tax state) in the long-term. (If this is too generic a question, please let me know what other information I can provide.) Thanks for your help.

[nelsona]

Where will you be physically working?

If you want to keep your GC, you will need to live in US.

[sws]

Okay, thanks. Good to know. I work remotely, so any low-tax state will do.

So even a marriage GC would be lost if not working in the US?

[nelsona]

Yes, after two years, or after it becomes clear to CBP that you live in Canada, whichever is shorter, your GC will be confiscated,