Of all the Toyota models, Toyota Canada invests the least in the Avalon. They special order a "mid level trim" unit with Nav and throw nothing at the marketing side. The Camry plant in Kentucky has run at capacity for years and Toyota Motor charges Toyota Canada a premium for the Avalon which knocks it out of the market. A US Avalon similarly equipped is about 6K less.
The money used Avalons bring in the US is amazing. Their supply strategy works. The new Avalon will be the cheaper cousin to the new ES350. I expect no change in supply and price strategy in Canada. So if your looking at the new Avalon which is gonna be the ultimate Buick FWD large Cadillac sedan that GM could/can never build, go to the US and import. No duty and warranty honoured in Canada.
Firstly, I don't think you can even compare the Maxima to the Avalon. Two different markets entirely.
Second, Maximas sell in Canada better because Nissan Canada throws big money on the hood. It's the only way they move. Maxima with roof, NO Nav, freight, $43K list. Time your purchase and Nissan will throw 8K on the hood.