The Cupertino company has just released the public beta versions of macOS 10.14.5 and tvOS 12.3. As you already know these versions are totally free for all registered users in Apple's public beta program and it is not necessary to have a developer account to install them on our devices.
The changes that we find in the developer versions released a few hours ago are exactly the same as those found in these public versions of macOS and tvOS. Remember that version watchOS does not have a public beta version and therefore it does not appear among the versions released a few minutes ago.
Undoubtedly these versions allow the user to know the news implemented in the different Apple OS but the best thing is that Apple also benefits from it thanks to the fact that many more reports about possible errors or failures arrive and that more users have these versions installed on their computers. In addition, the user can send Apple bugs in the form of a report and these are usually solved by the company or at least reviewed.
On the other hand, it is important to say that although these beta versions are stable and fully functional, it is better to install them on partitions or external drives on Mac. In this way we will avoid having any failure or incompatibility with the applications or tools that we use for work or similar. As we say, these versions can already be downloaded if you have the previous beta version installed on your Mac and if not, you can always register in the apple website to start testing these betas before they are released to other users.