Personally I use Ventoy.
It's super easy and I just have a stick that sits on my desk full of ISOs just waiting to be used
Yeah, I don't know why it is never mentioned anywhere. It's the easiest way to do this and you can throw as many distros on it as you have space.
For those who haven't used it: It basically has its own little boot menu on the stick and a folder where you put all the .iso files into, which then appear in the menu to load from. No jiggling or reformatting to swap to different images necessary. You just copypaste the iso files straight onto the stick.
It's great, but might not work with some distros. NixOS is one of them
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