Congrats on your decision. Whether you go Merlin is (of course) all up to you. The benefits of loading Asuswrt-Merlin unto your routers are substantial:
https://www.asuswrt-merlin.net/features.
A warning upfront: once you go Merlin, it'll be hard to be without it, because once you get used to it, returning to stock will always leave you with a feeling thay you're missing something which should actually have been there in the first place. I've tried it myself, but it didn't last longer then a week.
Follow the instructions at the bottom of the about page of
@L&LD , called
Best Practice Update/Setup Router/AiMesh Node(s) 2021 and odds are big you don't want to get back to stock ever, because you'll likely be missing something of the goodies which are built in or available to Asuswrt-Merlin (check out the
Add-ons subforum for example, there are many voluntary coders active on the forum and some elsewhere, but still providing updates and it mostly comes together in once place called
amtm, short for the Auswrt-Merlin Terminal Menu which gives you the possibility to install, update or uninstall most of the scripts and goodies I mentioned before and maintain them. No need to follow the install instructions on said About page, amtm is now included by default. If you know your way around ssh, just fire up an ssh-terminal and enter
amtm
press<ENTER> and that's all there's to it.
At the time of writing this, the latest stable build is 386.2_4, which can be found with the first link provided above. Make sure you download the releases for the RT-
AC68U and RT-
AC86U, instead of the
AX flavours. They don't mix together.
Having said that all that in favour of Asuswrt-Merlin, when you don't need of all this, you'll be fine with stock firmware. Many people are and find it more than enough to run their home network.