Thanks, Montreal does seem to be more appealing for a tourist, which is funny because it is a city that has never even crossed my mind as a destination before.I live in Ottawa.
Montreal is an infinitely more fun city than Toronto in my opinion.
I would spend most of your time in Montreal.
Niagara falls is definitely a day trip you can do from Toronto it takes around an hour and a half to two hours to get there from Toronto depending on the traffic.
I assume you're going to be driving from Montreal to Toronto? Good luck with the 401 it is a nightmare.
Montreal always has lots of stuff going on as far as concerts and things to do.
Toronto has the Blue Jays, the maple leafs, I would recommend Ripley's Aquarium for a few hours.
Both are big cities though and have events happening frequently.
We will actually be getting the train between them - 5 or 6 hours of watching the world go by is a lot more appealing that looking at the @rse of a truck while driving on the wrong side of the road for 6 hours