Surprisingly, for almost all the things that I've bothered to compare, Amazon is actually cheaper than Temu. Even cheap toys from China that I thought would be Temu's bread and butter. And of course the shipping is no contest. The deals look good in their app but try searching for the same item on Amazon and I bet you will be surprised.
Temu sometimes gives you more flexibility to order a single copy of small items while Amazon might only have bundles. But then Temu has a minimum order size you must meet while Amazon doesn't. So I haven't found any reason to use Temu after their ridiculous free money coupon for new users is gone.