Arch may have packages first but generally Fedora will have its packages integrated first; ie, if package A and package B release new versions to work with each

Arch may have packages first but generally Fedora will have its packages integrated first; ie, if package A and package B release new versions to work with each other, then Arch may have the new versions first, but when Fedora releases the new versions then they'll be configured to work together, while Arch's packages may take a little longer for them to be configured appropriately