(Double posted, so reply to your list)

I've been looking for a distro with recent KDE and recent kernel.  So, the benchmark was Kubuntu 25.10 (v6.4 KDE, v6.17 kernel).

1. Started with Mint + "apt install kde-full".  Result was comparable to Kubuntu LTS, ie. v5.27 KDE, v6.14 kernel.  Makes sense, since Mint is based on Ubuntu LTS.

2. Then, tried LMDE + "apt install kde-full".  I was surprised to get a rather recent v6.3 KDE with v6.12 kernel.  I was expecting an old KDE, even older than Mint version.

3. So, decided to try Debian testing + KDE.  I got v6.5.4 KDE (latest) and v6.17.12 kernel.  Not bad.

Right now, Debian testing is compiling v6.12.62 and v6.18.1 kernels for Raspberry Pi Zero 2W.  We'll see how it goes.

To those using Debian testing, how would you rate its stability?  Is it suitable for daily PC?