In what way would it work much better than the USB Adapter I currently use? For what it's worth, it seems like the past couple days there might have been issues anyway with my provider.
Performance wise, if you are happy where you are at probably no appreciable difference at all as long as your USB adapter is USB 3.0 and plugged into a 3.0 port.
If you are having problems and think it's the adapter then there's only really two ways to check it, a new adapter or try another device (laptop, phone) on the wifi and see if it ever disconnects.
Generally speaking I'd be more likely to blame the router before the adapter though.
If you are losing internet access that doesn't necessarily mean you are losing your network connection, so your Wifi could be working perfectly fine if your internet is down. You can check that by looking at the network panel on the start menu (by the clock usually) or just pull up your router's configuration page in a browser.