I had a look at those, little out my price range atm but I was thinking being as someone wants my two asus rt ac86u ,right now at a good price, I was thinking about getting two asus rt ax82u ....using one as a mesh and one as a main router ...Or two asus rt ax86u.... Am i right it saying and, yes I dont know that much , that the ax86 is better overall than a ax82u for this purpose of mine...?
Just wire between upstairs and downstairs, use your current stuff and and be happy, place the upstairs router such that you can wire high bandwidth capable non portable gear ( ps/xbox and TVs etc ) to the router/node to reduce wifi contention, this would give them 1Gb potential, basically take the approach that static devices should be wired and you'll probably have better wifi that having everything connected to a wifi device.
Even if you don't wire between floors you still want to wire devices to the mesh node for performance as you are halving wifi bandwidth with out dedicated backhaul.
As an example on my cheapy AX3 (which I don't recommend, just what I have as I am a tight arse) with wired backhaul, I get the full 1Gb Wifi to my 160 Mhz 2x2 Wave2 AC and 2x2 6AX devices in either rooms (can't go any faster as they only have 1Gb ports) but between one floor and office I use wifi backhaul to another AX3, which means it has to split the bandwidth between inter node comms and wifi devices but in my house I have wired all the devices in the office upstairs to the node, the allows the wifi connection to be predominently used to connect to the main router, this gives me the potential of a full 1GB wifi link between floors, wired PCs to the wifi connected satellite node will also get the full bandwidth potential. Of course if anything in the office competes for wifi bandwidth the speed will massively drop off as it has to do the wifi relay thing, but that's fine, handheld devices on wifi are rarely chugging down lot's of bandwidth, with the higher consumers wired everywhere else wifi traffic is reduced.
Obviously if many devices around the house are asking for all the bandwidth there would be problems and there are in my house for example when I pull big action cam clips to and from my NAS to laptop, but you can't avoid that what ever you do as I have one machine saturating the 1Gb LAN port when I'm pulling a 100Gb or so as it goes through the backhaul link, will upgrade this to at least 2.5G at some point in the future, probably when Wifi 7 becomes a thing, ideally you want the backhaul link to be better than what the Wifi AP can deliver.
If security is important to you, perhaps look at brands other than ASUS.
One crappy vendor down, who's next?
www.theregister.com
That's almost 10yrs ago, case mandated that independent security consultants test their firmware every 2 years for the next 2 decades, this would suggest to me they might actually be in a better place than many providers on the security front?
Certainly better than my Huawei gear sharing data with Mr Xi