This isn't borne out by the numbers, for the average package. Not for openSUSE or for Fedora. The only full Linux distros I currently see with a higher percentage of up-to-date packages than Arch are KaOS, CRUX, Slackware and NixOS: https://repology.org/repositories/statistics/pnewest

Of course, whether or not the most important packages to you hit each distro first could be a totally different story.

Overall, openSUSE Tumbleweed is very up-to-date, though: ~76% by this measure— right up there with Fedora Rawhide and Gentoo.