Ray, here's a sample comparison of add on sound cards.
http://sound-cards-review.toptenreviews.com/
You'll notice a rather large disparity in some specifications which could lead someone to choose one over the other, depending on their requirements vs budget.

Your comparison of Refrigerators to sound cards is like comparing apples to oranges.
Also, while some appliances are simply rebranded, others have different specifications required by the OEM. That situation is the same with many products. As an example, some Yamaha products are made by Phonic even though Phonic makes their own products as well as OEM products for other compamies.


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