Hey Mai83,
I'm a Canadian and I also have a deferral from Australia, the University of Sydney, as well as an offer from Trinity College.
Going overseas for medical school was really a back-up plan for me as I was intending on re-applying to Canadian schools this fall when I complete my Masters. I held back from re-applying in Canada this past admissions cycle and sent out some international applications in hopes of deferring them as backup plans.
However, now I find myself debating the idea of simply skipping re-application to Canada and taking one of the offers. The Canadian Medical Association published a report on Canadians studying medicine overseas (Search the CMAJ site or write me back and I can email you the PDF) which shows that the best odds for returning to Canada, as far as the stats of this report are concerned, were for those students studying in Western Europe. This primarily consists of Irish medical school graduates.
For me, I've always had it in my head that I would study medicine in Canada and get an MD at home. I'm rather stubborn, and would very much like to give things another go in Canada now that I have this Masters. However, I know that the more logical choice is to go ahead with the option in Ireland. I am not aiming for a competitive residency (Comm. Med.) and the current literature and CaRMS' direction (IMGs being allowed to compete in the first round) are pointing towards increased training positions in Canada for those with citizenship or permanent residence. And while this can't be guaranteed, my conversations with TCD staff and students have been promising. It's also interesting to note that currently 25% of practicing physicians in Canada have not been domestically trained.
Lastly, I'm from Ontario. So I didn't feel compelled to take organic chemistry since it isn't required by the majority of Ontario schools, especially the ones in which I was interested. So my options are limited for re-application outside of the province. Realistically, my best shots are with Northern and Ottawa, the two schools with which I previously had interviews. But after recently visiting Ireland, Lakehead & Laurention Universities (and I mean no offense) don't hold much of a candle next to Trinity College.
I believe I've done all the research that I can manage and it has become a personal decision at this point. However, I feel that I've already made the decision and right now I'm slowly warming up to the idea.
Best of luck with your choice.