WiFi will never result in the same speeds that a LAN connection will have. My Linksys WUSB6400M WiFi adapter got 150-225 mbps download speeds. My LAN connection to the router got 943 Mbps peak.
I replaced that Linksys adapter with an onboard m.2 Intel AX200 module, which is designed to support the upcoming IEEE 802.11ax standard. While it has a whopping 2.4 Gbps peak data rate capability, it "only" connects to my Cox Panoramic WiFi modem at 1.7 Gbps (which is still a higher data rate than the 1 Gbps LAN connection).
At 15' away from my WiFi modem and with direct line of site from PC to modem/router, the Intel WiFi adapter clocked in with download speeds of 660 Mbps peak. Your distance from your modem and any obstacles in between can/will degrade your signal strength.
As an added bonus, Intel's m.2 adapter also has onboard Bluetooth 5, so I now have two fewer USB devices plugged into the computer. I bought the adapter last week in an Intel kit that came with an antenna array that takes up one PCI slot. It does not connect to a PCI slot on the computer - it just needs an empty slot to mount the antennae.
The best part? This Intel adapter and antenna kit was $29.99 from Newegg, vs. the Linksys adapter, which retails for $69.99 (but can be found for $59.99 from most online resellers). Buying this Intel adapter has made me rethink the need for a LAN drop to the PC or running MoCA, although I would like to realize all of the speed that I'm paying for.
