Education Administration in Canada

I can't tell you much about diplomas as I am a B.Tech myself. But the main difference between a post graduate Diploma and an advanced Diploma is that a post graduate Diploma as the name suggests is a PG Diploma, whereas advance Diploma is same as the regular Diploma only that its a 3- year degree course as compared to a 2-year regular diploma. Masters as well as PGD, both are beneficial after graduation in mechanical engineering. But the difference between a Postgraduate Certificate, a Postgraduate Diploma and a Masters M.A. Or M.Sc. Or MS) is in the amount of credits the course contains. A general Masters degree contains a greater number of credits (usually 1.5 times) than a post graduate Diploma. More number of credits enables one to achieve better results with increased probability of scoring. So, it would be a wise decision to earn more number of credits and increase job and career prospects in a 2- year time which is same for both Masters and PGD. That's all I know. Hope it helps.