Hi, I am no expert but here are my thoughts..........according to me with 1 year prog you are at a disadvantage on 2 points:
1) you only will get a 1 year PG work permit which will not give you enough experience after school. I am not aware how difficult or easy it will be for you to get a LMO after your studies, if you choose to stay on in Canada.
2) 1 year PG study will DEFINITELY not allow you to apply through CEC (graduate route), unless you get a LMO, are able to extend your work permit and work for a company for 2 years (there is a talk of CIC changing foreign worker experience to 1 year).
But, bear in mind that there are no points system for CIC. You either qualify or you do not. That has its advantages and disadvantages because it means that if you do not qualify on even 1 of their requirements, they reject the aopplication, no questions asked. But, if you can collect all the necessary paperwork then it seems to be smooth sailing (at least according to all the posts I have read here)
Finally, this is a decision you have to make keeping in mind your financial constraints, family commitments and future plans.
Personally, I would recommend a 2 year PG course but make sure that it IS a 2 year course. It should not be a 1 year course that has become 2 years because of the way it is structured for example a 1 year course can take 2 years to be completed because the classes are held only 2-3 days a week. The course should be a full time course (as advertised on the college's website) with 4 semesters and all semesters having full time classes.
Good Luck and Best wishes.