It is not a small ISO and requires a 4GB USB disk (if you are creating a Linux Live USB).
This ArcoLinux review focuses on the ArcoLinux ISO. They are more similar to Arch Linux and are designed to help users learn more about Linux so that they’re able to handle a more command-line based experience in Arch Linux. The main ArcoLinux comes with all the GUI and niceties, while both ArcoLinuxB and ArcoLinux D are minimal distributions that either come with one desktop or none. ArcoLinux, on the other hand, has three different versions – ArcoLinux, ArcoLinuxB and ArcoLinuxD – which serve different needs.
Many distributions like Ubuntu and Fedora have different flavors (mainly different desktop environments) of the same Linux core.