Hi Tower,
I live in rural Vermont and had the option of local treatment in Burlington, VT or travelling to Boston. I chose Boston for the same reasons that others have mentioned. Since oral cancer is less common than some other types, you want to be treated by a facility which sees and radiates a lot of cases.
In particular, you might want to ask what type of radiation you would be receiving in both places. If Toronto offers IMRT (intensity modulated radiation therapy) and your local treatment center does not, the decision might be easier than it now appears.
Regardless, best of luck with your treatments. Best, Sheldon