I’m not sure I know what you mean by diagnosing, but it’s usually a good idea to use the same distro you’re having trouble with.
Diagnosing hardware issues, which doesn’t necessarily need the same distro.
Adding on to other suggestions, if you’re not aware of Ventoy it’s a very handy tool. Using it you can have a USB drive with several live images on it which you can choose at boot time. Great for quick testing, just drop an ISO in a folder!
Unfortunately I believe the usb has to be created from Windows…
What makes you think that? Their website has instructions for installation via a Linux box. https://www.ventoy.net/en/doc_start.html
Look no more, use this! https://www.system-rescue.org/System-tools/
Console ArchLinux every time. Create a USB instance and then load up what you need.
You don’t need a GUI.
You don’t need a GUI.
Thanks for your opinion, but you don’t get to decide what I need. I wanted a simple distro that I was familiar with, so that I could teach it to someone with basic computer knowledge. Teaching how to use a terminal was outside the scope.