

I would suggest whatever you pick, it should be a similar base to what you run or are most familiar with.
If you run something Debian based, you should recommend something Debian based. Fedora, Arch, etc.
The same is also true for desktop environments, if you use KDE, recommend KDE. If you run something not necessarily beginner friendly, recommend what you’re familiar with.
At some point you’re going to be asked questions, so the more familiar you are, the better for both of you.
I’ve used dropbear in the past and it always feels a little janky, but it works well.