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How do the Ubuntu, Fedora etc Live CDs compare with SystemRescueCD?
System Rescue CD is my go to tool when I want to fix issues on systems which don't boot properly, customize partitions etc, but it isn't often available on a lot of providers and I have to request it when I need it.
What of these live CDs? From what I understand they allow you to do everything you would normally do if you installed them only that you can't save your work after.
Do they contain the tools an admin needs, like screen/tmux, GParted, ncat etc which I need a lot of them time?

Comments
you're comparing chicken to orange here. use OS that fits your use case. Ubuntu, Fedora has no direct benefit having rescue tools installed by default, even if they are capable to.
do one and do it well. if you need linux-based rescue cd, try https://grml.org/
The problem is not getting what I need. It is getting the service provider to add it to their list of ISOs.
The one you want may not be on the list and it may take time for them to add it, assuming they are willing to.