Canada

Dear Shashank,
Apparently, both the countries are good and have world famous universities. If you ask about a third country it is actually Germany which has a higher reputation in the field of automobile engineering. You may zero in your country choice based on the admission requirements, post study work options , expenses etc. USA is expensive.

Stress is everywhere.
The most important thing is that which area fascinates you the most. USA has very good scope in mechanical engineering. But please ensure Never apply to AZ, CA, NM as most of the companies here are defence companies and will not hire a foreigner.
For Canada, the scope is good if you study either of the engineering from a Canadian University.

Dear Ashik,
Difference are generally in terms of selectivity: Canadian universities are more competitive and selective compared to Australian universities, in terms of program structure MS in Canada is highly research oriented or course based which is not research based. Such segregation is not seen in Australian universities though MS programs are research based. PGD is a diploma course available both the countries, as mentioned Canada is more selective.

Hi Lakshman,
Universities in Canada mostly requires 70% or above for M.Sc and MASc programmes. You can check with the universities, please email them your profile and grades and see what they have to tell you.

Hi Vishal
I will strongly suggest you to check the skilled shortages list of Canada, it is available on their immigration website or just google. Check occupations related to quality engineering management and mechanical engineering technology design.