Agreed, for gaming your best choice is Ethernet followed by powerline using a pair of AV1200 of better adapters (such as the TP-Link 8010 set for around $50 on sale).
If you go wireless for gaming it depends on your specific local conditions and distance from the wireless router.
You will need to provide additional information on your wireless router and computer hardware/OS to get any useful recommendations though. It is very little help to have an AC1900 PCIe adapter if your wireless router is only N300 2.4GHz.