The games will depend on the format. For eg, some regions are running video formats in 'PAL' while others are running in 'NTSC'. So you need to check what format is being run in Argentina and Canada. If both are the same, there should be no issue. However, if they are different (for eg, Argentina is 'Pal'P and Canada is 'NTSC'), then you may have a problem.
You should buy the format being run in Canada since that's where the games would be running eventually. From what I've managed to figure out, PAL-N variant is used in Argentina. Source: http://en.wikipedia.org/wiki/PAL
For Canada, it seems to be NTSC-U/C (U/C refers to U.S. + Canada). Source: http://en.wikipedia.org/wiki/NTSC