If you want to fly from Canada you do not have to take any exams or medicals, just your standard proficiency check & you need to obtain a bit of paper to put in with your license to prove you hold all the necessary documents, this only costs $45 from Transport Canada & takes about 15 mins to issue & valid for 12 months, A bargain!
I have been looking at hiring rates there and they are more expensive than the USA, But like everyone is saying, I think you can gain allot more practical experience there?
Enjoy
YYZ