Another vote for ventoy. Means I can use my large fast USB drive (actually an mSATA SSD pulled from a broken laptop, in an adapter) as a collection of boot media while keeping the rest of the space for other use. I don't need to boot from a distro CD often these day, but when I do it is nice that it is much faster than my other USB sticks, more convenient than carrying a few (Debian, Ubuntu, psSense, Kali, ...) around, and more convenient to update when I need something new or otherwise specific for the situation.