Although Whonix 14 has not been blessed stable you can still use the images since all of the known serious bugs have been fixed. The only thing holding up this up is creating and testing New Qubes templates. (Have to upgrade all (VBox, KVM, Qubes) Whonix 13 → 14 at same time)
Related:
https://forums.whonix.org/t/whonix-14-release-blockers-status-of-whonix-14-development/5111/6