Hi! If I were you, I'd contact https://windowsdoorspro.ca/ because you can find the right specialists there who can explain the differences between options for the Canadian climate. I've worked with this service before, and they helped me find the right team. In my case, the consultant didn't push the most expensive package, but asked about my budget and the location of my house. After taking measurements, they suggested several options with varying levels of insulation. We also discussed street noise levels, as I have a road nearby. As a result, I got windows that really help retain heat in the winter and don't break the bank.