Permanent residents in the United States become eligible to become citizens after 5 years but in Canada, they become eligible after only 3 years of living as permanent residents. Both countries confer unconditional birthright citizenship to individuals born within their territorial limits, and are the only two industrialized nations to do so.
Comparison chart
Travel without a visa
Both U.S. and Canadian citizenship make international travel easy. Holders of a U.S. or Canadian passport do not need a visa from the embassy to travel to most countries (China and India are notable exceptions). Canadians do not need a visa to travel to Argentina and while Americans don't need one either, they are required to pay a reciprocity fee online in advance of their travel. Chile and Bolivia issue visas on arrival to U.S. citizens but Canadians do not need a visa in these countries.[1][2]
Comments: American Citizenship vs Canadian Citizenship