Temu vs. AliExpress is usually a shipment speed vs. cost tradeoff. Their catalogues also differ quite a bit in some areas, so sometimes one has to use one or the other.
I feel like AliExpress has improved in this area though, likely due to pressure from Temu.
A few months ago, I had an AliExpress order beat an Amazon order to my house. I wasn't using Prime, but the AliExpress order did ship from China. It took about a week.