(Earlier reply has somehow vanished...)

On Mon, 08 Jan 2018 00:49:16 +0000, teor wrote:
...

When there are multiple supported tor versions, which one should be stable?

At the moment, we support 0.2.5 and 0.2.9 as long-term support, and 0.3.0 and

0.3.1 as regular releases.

The newest/highest, probably. Essentially the one also
proclaimed as stable on the source download page.

Should stable be 0.3.1 (and change to 0.3.2 next week)?

Yes.

Do you want a long-term support branch as well?

No. I just need one version to build a relay.

...

If you want something that's easier to scrape, and signed, check for

new source releases at:

Scraping would be a fallback.

...

$ curl http://197.231.221.211:9030/tor/status-vote/current/consensus-microdesc | grep server-versions | tr "," "\n" | tail -1

0.3.2.8-rc

Basically current would be the highest non-rc on the list,
and alpha would be the -rc (or current if no -rc present).