as bz said, "post-doc is not a real job yet", I doubt two-year post-doc experience with Ph.D degree from China can lead him to something. So many Ph.Ds from China are stuck in the post-doc stage for years and could not find way out. A Ph.D degree from Canada might give him bigger chance to launch a job in US although everything is not absolute, other factors like his field, his school's reputation, his abbility to interact with people, etc. can affect his future a lot.