I’ve been looking into this as well, and for Canadian conditions the most important factors are a reinforced aluminum frame, high snow-load rating, and strong wind resistance.
From my experience, Lousol https://www.aluminumpergola.ca/ heavy-duty aluminum louvered pergolas are a solid option. They’re built with durable materials and handle harsh weather quite well if properly installed. The adjustable louvers also help manage snow and rain when closed, which adds extra protection.
Overall, I’d focus less on design and more on certified load ratings and build quality — that’s what really matters for long-term performance in Canada.