Just to finish the thought. Look at the difference in the down used by each for their Parkas.
Canadian goose is considered better than duck down (and is much more expensive) for several reasons. Another factor is loft, the more it is the warmer the jacket will be for the same ounces of down and the more compressible it will be. The final factor is how many ounces of down are ion the jacket, but oddly enough that isn’t given by either manufacturer.
Snow Peak for example on their parka (which retails for around $600) is:
Materials Shell: 96% Polyester, 4% Aramid (DWR + AC Coating). Filling: Minimum 90% White Goose Down (800FP). Lining: 100% Polyester. Japan Fabric.
So it’s 800 fill goose down. They do have their cheaper jacket at half the price with duck down.
Canadian Goose for their expedition parka (which was over $1,000):
fill 625 Fill Power White Duck North American Down,
So it’s duck down, not canadian goose (ironic given the name), comes from North American ducks, which are considered lower quality - true!, and has substantially less loft.
550-750 fill is considered Very Good
750-900 fill is considered Excellent
https://www.mountainwarehouse.com/expert-advice/down-jacket-guide
So you can quickly see the quality differences inside - and this is also true when compared with the best down jackets out there by North Face, which are goose down and various models between 550 and 900 loft.
Consequently, Canadian Goose is a great marketing brand on a hot roll right now, but it’s not because its the best or the warmest jacket, especially given the price.