https://trac.torproject.org/projects/tor/ticket/24482 is resolved wontfix - too much work - so back where we started.
arma has the impression that Debian stable will follow LTS releases going forward. I think the easiest (less work for Patrick) and most trustful (Whonix doesn’t touch Tor) and safest (fast update from Debian repo) is to follow LTS release by Whonix default. That will make many “hardened / feature-hungry” users unhappy. But it’s not that difficult to switch repo to torproject and get the latest stable version - the caveat is that breakage is resolved by user / community.
Whonix-13 Tor 0.2.5 LTS (no changes now but hypothetically) Whonix-14 Tor 0.2.9 LTS