I'm in a line torn between either Asus RT AX82U or Asus Tuf Gaming AX5400. Can anyone give advice on which of these routers is better?
As long as you have ANY older WIFI devices, you will have to have WPA2 enabled. Unless you do something that would cause someone to sit and capture your WIFI traffic long enough to be able to crack it, you have little to worry about.
You can. But you will have to have WPA2 & WPA3 enabled on the SSID (assuming you want older devices to be able to connect). Most of the WPA3 WIFI devices have a "transition" capability which allows WPA2 and WPA3 to be used on the same SSID. Newer devices use WPA3 and older devices use WPA2. A requirement of WPA3, that would be enabled in the "transition" mode is protected management frames (PMF). This was an optional feature on WPA2 that is required on WPA3. MANY older devices won't work with PMF enabled. I have WIFI6 hardware and don't have WPA3 enabled because of the problems with older devices.So I can't have wpa3 but have older devices connect to the wifi6 router?
You can. But you will have to have WPA2 & WPA3 enabled on the SSID (assuming you want older devices to be able to connect). Most of the WPA3 WIFI devices have a "transition" capability which allows WPA2 and WPA3 to be used on the same SSID. Newer devices use WPA3 and older devices use WPA2. A requirement of WPA3, that would be enabled in the "transition" mode is protected management frames (PMF). This was an optional feature on WPA2 that is required on WPA3. MANY older devices won't work with PMF enabled. I have WIFI6 hardware and don't have WPA3 enabled because of the problems with older devices.