Hi jared3227,
I don’t have any personal experience with these but I think it would be safe to assume that the first one uses lower quality materials and that most of the quilting would be polyester with perhaps a “touch” of wool at best for label copy and marketing purposes.
The other two look very similar but when you are making these types of purchases where the prices are low and the picture or description may not always be accurate, I would ask for a picture of the tag which shows the type and percentages of the materials in the cover so you can compare them and I would also confirm with them that if the product you receive is different from the picture that you would receive a “no questions asked” refund at their expense … and have it in writing.
Other than that I would make sure that your expectations are realistic that the quality of the product is probably reflected in the prices.
Hopefully some of the members here that have purchased any of these can share their feedback with you.
You’ve probably seen this but there are also some additional sources of covers in the component post here.
Phoenix