Well, the same companies are catering to different demographics down here....they cater to whatever the focus groups tell them people of different backgrounds are supposed to like...
In Montreal, I'd always noticed that more people than in New York wash in cold water. Tide always seemed to be more of a "must" brand-wise then others, especially in francophone neighborhoods.
Up north in Chicoutimi, I noticed more "Arctic Power" (maybe because it was colder there?)
As you moved further west, people seemed more likely to buy other brands like Sunlight, or even premium store brands from chains like Loblaws.....I remember searching for Lemon ABC and Lemon Surf to no avail.
They have (or had) fewer brands than Americans...but it was on a Quebec supermarket shelf that I first saw plain washing powder packed in thin plastic bags...not much of a discernable fragrance.
They'd have Tide and Cheer liquid, powdered Sunlight, Arm and Hammer, and sometimes Arctic Power, Wisk liquid, Purex liquid, a house brand and that was it. The shelves had a higher proportion of powder vs. liquid then in New York. Tide and Purex had lemon variants, and not much else...and of course Sunlight was lemon to begin with (I think there was a "Free and Clear" as well, like All liquid here)...
Fewer choices of softener and bleach scents than here, and the brands were different (Clorox was Javex, Suavitel was Fleecy, etc.)
I've never been out west, like to Vancouver, but I always noticed these differences.....there is definitely less emphasis on laundry products (and shelf space) then in the supermarkets here. In New Jersey, the laundry products sometimes merit a full aisle on their own.
Canadians, correct me if this has all changed up north.