Arch is a rolling release that gets the newest software once it's available. Ubuntus is Debian-based and it's also following the principle of stability over modernity so there's a big difference between how recent software you're gonna run on those two types of distros. But if you want to try the rolling approach you doesn't have to go directly for arch, you can use some Arch-based distro like Manjaro. I know there are also Arco, Artix and Garuda that are arch based but I don't tested them. You could use them, experience pacman and aur but without struggle of setting up arch and once you get comfortable you may want to give arch a try