Understandably, all of these distributions only offer 64-bit builds. They all have some capability as a live distro. For U some of them, the preferred base distro will come down to personal preference and previous Linux experience.
AV Linux is based on MX Linux, which itself is based on the stable branch of Debian. This gives command-line tools that will be largely familiar to users of other Debian derivatives, such as Ubuntu and Mint. It draws its packages from the MX Linux repositories, which is a mixed blessing. In some areas, these repositories are ahead of what Ubuntu Studio has to offer in the way of audio software; in other areas, Ubuntu Studio has the more up-to-date packages.