There are a lot of questions regarding the availability of new features. This explains what the difference is between the release types and when to use them.
On the Domoticz forum you can find the latest release information.
Stable releases are well tested releases containing new features and bug fixes.
Binaries will be available for all supported platforms. So when supported by the platform of your choice you can use automatic updates.
Use a stable release in Production environments (eq the one your wife uses or contains data you want to keep)
Beta releases are releases ready for testing containing new features and bug fixes.
Binaries will be available for some systems (Raspberry Pi will be released earlier as the Windows builds). When supported by the platform of your choice automatic updates can be used when selecting the Beta-channel.
Do NOT use Beta versions for production, it's most likely there are bugs and errors in this release. Even features that worked before can stop working. So if you like your system to work and want to keep the data, please use a Stable release. If you want to help testing new features and bug fixes, you are welcome to download the Beta releases on a test environment.
It's also possible to download the source code from Github and build Domoticz yourself. The sources containing unfinished new features and bug fixes.
No binaries will be distributed.
Only use the sources as developer on a development machine.