walmart.com is better designed that amazon.com. I don't know when that happened but you can take a look at two product pages for the same book and be the judge. [1][2]
That's just the tip of the iceberg. I could rant about Amazon's software for days, but in the end software doesn't necessarily mean they are a bad company. If I order something from amazon I expect to get it quickly and in the case something goes wrong I can talk with someone who will be more than agreeable. That is why they are successful, not because of their software prowess.
[1]: https://www.amazon.com/Thinking-Fast-Slow-Daniel-Kahneman/dp...
[2]: https://www.walmart.com/ip/Thinking-Fast-and-Slow/20530246