Temu’s UI is unusable. You are constantly presented with roulette wheels for coupons you can’t dismiss. Its dark patterns have dark patterns. AliExpress is only mildly better in that you can dismiss stuff.
Both T and A still have listings for things that will likely result in you getting something entirely different. This usually applies to more expensive and physically larger items. You might order a greenhouse and get a photo of one or a schematic of one. And I don’t mean that the description will make it clear.
Both have a pattern where they might list let’s say an MP3 player which costs $30 but the price on the listing will be $3 because one of the product variants is just the case.
Amazon has comparatively reliable shipping and it’s included with the price on a majority of products if you have a Prime membership. While Temu and AliExpress do have US-based shipping they still don’t guarantee when the thing will arrive and if you are looking at these products the price difference basically disappears.
I am not defending Amazon by any means, but purely on usability it wins hands down.