My only reasons to buy on Ali is when I need something simple like velcro that can be cut to length or other small scale stuff electronics (e.g. Rasperry Pi 0) and it doesnt have to be fast.
Ironically the shipping is either free or so cheap it's better than domestic amazon.
I often suspect they sell the same item but order it with DHL shipping (our domestic shipper) with high priority shipping included in the price (2€ item + 8€ shipping = 10€ on Amazon + "free" shipping)