New SSID:
Why a new SSID? https://www.snbforums.com/threads/i...-ax88u-rt-ac86u-node.60551/page-2#post-532915
Sure, using the same SSID's and same passwords and using features like SmartConnect is easier. I don't go for easy though, I go for best practices that have worked for me and my customers for almost 7 years now.
First, SmartConnect
isn't. Too many issues (please use search to read about) and not enough benefits. Too many dependencies on the specific devices used, and with the devices to router interactions. Also, assuming that a feature that seems to work on a different manufacturer's equipment will work on the new one you wish to test/try properly, is not a good way to start the test.
If you were moving from an 'N' class to an 'N' class router, or from an 'AC' class to an 'AC' class router, or from an 'AX' class to an 'AX' class router, using the same SSID's
may not be an issue. But going from an 'AC' class to an 'AX' class router from different manufacturers is enough for me to not want that wrench thrown into my testing gears.
And even if you were moving from just the same class to same class Wi-Fi, and even further assuming that the SSID's and passwords adhered to the suggested limitation regarding alphanumeric length and no special character restrictions, there is still no guarantee that the two manufacturers (or even within a model line, same manufacturer, but two different models) would have the same expectations either.
It is simpler to just use new SSID's. At least to test with. If you are averse to keeping the old SSIDs in play, change them after your testing is complete (with a smaller subset of your client devices connected). If any issues arise; you'll know just where to start looking. (And is therefore why you change settings/options and features slowly when setting up a new router... you're testing as you go and testing, takes time, to do it right).
There is nothing stopping anyone from not following the suggestions as outlined in my posts. However, ignoring the 'best practices' I have picked up over the years (mostly) from this forum and my own experience is done at your own risk to router/network stability, reliability, and its performance.
The one thing I know about Asus routers after all this time. They are either properly set up or they're not. When you're doing an 'in-between' reset/setup (i.e. picking
which steps you'll do), you're only rolling the dice that in your current networking/Wi-Fi environment, with your current client devices, and with your expectations/assumptions, things will work.