Congrats!
Now, curious - why would you want to fly to a different country - then enter Canada by land crossing? You might as well fly directly to Toronto and get immigration formalities done at the airport.
However, in case you are going on a road trip - a rented car will have no problems, just that I think you'll have to mention in the goods to follow/goods with me document that the car is not being brought permanently to Canada and is just a rental vehicle.
Other than that, land crossing or airport - no difference