Pcc is a certificate. On top of it cgi will put a stamp in passport. But if we apply at vfs i think ni stamp in passport. I donno whether stamp is useful in any way or not. To my understanding pcc is important.
I applied for PCC at vfs. I got the PCC and there is a stamp on my passport saying edorsement PCC issued for Canada, and there is a stamp at the bottom with officers name and signature.
That is an assumption I have based on the posts I read in the forum, It is a little faster if you apply for both PCC & DOB together @ CGI since you cant just apply for PCC @ CGI.