Well if you want no fuss solid stable, then you should probably use Debian stable and not testing.
What more updated software do you find you need that's missing from stable? Any software I use where I want the fancy new current features, I install via flatpak, external repo, pip, compile from source, or whatever. I can't think of any time where I went "oh but I can't get that on stable".
You can start on stable and upgrade to testing later on if you really want to. But you can't downgrade from testing to stable without reinstalling.