Reply

Just wondering which visa is better and quicker, K1 or K3 under current circustance?

-Hard to say. But you need to get married first if you want to get K3 visa or immigrant visa. 

Should I wait and get the visa in Canada or I have to go back to China?

-Because you are not a permanent resident of Canada, you need to go back to China to get the visa.

If I need to go back to China, may I enter US custom? -Don't see a problem.

The situation is not good so far betwen US and China.  

Please advice. Thank you in advance!