In response to the question, what edition of ACE Mod ACE Team recommends to use: ACE Stable or Ongoing Development, we have the following to say:

We surely recommend the Ongoing Development over the Stable releases for a few reasons:

• Contains latest fixes
• Contains latest features
• Improves the Mod's development cycle and raises the quality - due to a much more vibrant eco-system; request/report vs response (fixes/additions); We simply can gain feedback and reports sooner, as well as react quickly on them.

Additionally, the ongoing development gets hotfixed asap, incase of immediate/serious issues, which I believe hasn't been too disruptive since moving to the weekly schedule.

Although our team perhaps would prefer even daily builds, the weekly schedule seems to keep us on our toes enough :).

Also, in general we schedule large sized updates at or before the Stable releases.

With the recent switch to OA, incl restructuring of the mod, this has perhaps happened more frequent.

On a side note, we do have basic internal testing (partially automated) but feel that the complexity and 

size simply means wide-spread testing is almost a necessity and certainly more useful.

With the monthly stable releases, reports/feedback is easily dated, and development stagnates due to having to wait weeks, perhaps a month, until new feedback/reports about current changes. 

You might wonder why we provide the Stable releases then 

It basically comes down to popular demand, and the server hosts which do not allow 'beta' software (or mods) to be used.

Besides providing a casual means of distribution (7z's hosted on websites).

Lastly I would like to add that the Mod's quality largely depends on the active reporting of bugs and feedback on our tracker; Bug Reporting - we can only welcome more .