Firstly, don't bother with usb
desktop or laptop
if desktop, and have free pcie slot, and running windows 10 or newer
any wifi 6 card from the major brands (tplink/dlink/asus/totolink/tenda)
all will use Intel AX200 inside, the best wifi6 card
laptop... depends on age
if its an old one using miniPCIE slot, not much options, AX200 cards do exist but they are cursed custom production from Shenzhen, not an official Intel product
if M.2 just get an AX200 or even AX210 (do not get AX201 or AX211)
if usb is a must because of reasons (cant install, dont know how to install)
then depending on your budget and usage either...
cheap ~rm15 N150 adapters, brand doesn't matter, max real world speed is 38Mbps
better ones cost more but should give better peformance
ax201/ax211 might be better if your platform did support CNVio2 (intel platform only of course). somemore very cheap to purchase due to lack of compatibility on many platform.