Using nvme m.2 adapter

[ysfm17]

I want to buy a new SSD but I found that the nvme m.2 price similar to SSD

so as I am already using the only nvme m.2 connector in my motherboard I need an adapter

I looked in amazon , I found 2 types
-PCIe Express
-PCIe x16

which one is better to use?

and are those adapters will give the real performance drive?

I was looking at thing for example:

https://www.amazon.com/Electop-Adap...G61WNTNERWC&psc=1&refRID=57SYYKZ3KG61WNTNERWC

all adapters seem from the same source but different brands?