You will get CoPR along with a single entry visa. This visa is used for landing. If you travel outside canada, you can use the single entry visa to travel back.
PR card and PRTD are for people who got CoPR and also used up their single entry visa for landing.
that will be my case, I would have used up my single entry while travelling to Mexico but while coming back I would only have COPR and work visa, which won't work as I am not a worker anymore. I need a permanent resident travel visa