What do you think is the best way to invest in Canada or Financing for a company?
I assume you mean how could your US company expand into Canada and how would that expansion be financed? In reading the FAQs from a government site entitled 'Invest in Canada', I think it might be prudent to first begin with a branch in Canada.
The rules for having a branch of a foreign company (US) doing business in Canada are not near as stringent as starting a new business there, if that is even possible ...
The 250 word solution includes links to three sites which provide excellent information for investing in Canada in terms of starting a business there.