The real question is, which side was better?
This debate is as old as the 'The Chicken or The Egg' or 'Ford vs Chevy'.
On the US side you are a stones throw from Buffalo and the Finger Lakes. The Albright Knox gallery is cool, the Historical Museum and the Science Museum are worth the visit. If you are a hockey fan NHL games in Buffalo are a heck of a lot cheaper than going to some of the big cities like Boston, NYC or Toronto.
The Canadian side of the Falls is definitely more touristy, with more to offer the kiddies. Clifton Hill, go-carts, museums, the Niagara Parks Butterfly Conservatory. There is also the Bird Conservatory, the Journey Behind the Falls and the recently opened Niagara Parks Power Station.
Niagara-On-The-Lake is a nice place to visit but can be a little busy for some. Best to go midweek. If you are into wine, I have to say that the Canadian wines are better than the NY or PA wines. And I'm not saying this out of loyalty. The Wine Council of Ontario and the Vintner's Quality Alliance (VQA) have been putting a lot of money and science behind Ontario wines for decades and it shows.
If you head into downtown Toronto you are about 90 minutes from the border. Hockey Hall of Fame, the ROM, the AGO, Ripley's Aquarium, the Distillery District, lots of museums as well as a very robust theatre district. If you are a sports fan there's the Leafs $$$, the Blue Jays $$$, the Toronto FC, the Argos and the Hamilton Ti-Cats.
Sure, Canada is more expensive, all tourist areas are more expensive. But with a 30% exchange rate you'll be fine. Also look for deals in the off-season.