In addition to that, I'd recommend using Tails instead as you avoid some risks.
Yeah. I usually suggest Ubuntu because it is a very popular distro and has a general purpose so it is very versatile. The popularity also means you can find any questions you have that are specific to this distro very quickly online.
I also prefer downloading, verifying and installing Electrum myself instead of having it come with the distro. The other problem with Tails is that it is designed to not-have persistence (although you can go around that by putting some effort into it) which is something you need if you are setting up your own storage device.