I would prefer to buy this one because it looks like it would a higher quality product than option A. The "Class 1 Medical Device" sticker on it makes me feel this way and so do the Support Level bar image, the use of the word "Innovation" in the brand label, the way the benefits of the product are listed out, and even the look and colors of the product itself as well. These things make me think the product would work better, last longer, and I'd be getting my money's worth as well.
What they didn't likeIt's just way too plain. The packaging doesn't really tell me much of what I'd want to know and the simple color of the product makes me think it's overall lower quality than option B.