It will really depend on your goals for a replacement router. In my experience, the Nighthawk is a very good series of routers, that I believe is aimed for folks who need high performance routing for online gaming.
Rudegar has mentioned routers by Synology, and I concur as they are excellent choices. In addition, I would suggest that you consider those by Asus.
The following site is an excellent resource for helping you decide what may work best for you:
For Wi-Fi, you will see standards, like WiFI5, WiFI6, etc. The higher the number, in general, the more capable the Wi-Fi network that the router supports. However, remember, Wi-Fi is a two-way "street." That means, there is no use paying to buy a WiFi6 router, when all of your network clients can only support WiiFi5. Currently, WiFi6 is the new "standard."