In this case, the Cupertino firm continues on its way with public beta versions and launches the following versions for users who are registered in the program that have been active for a few months. Remember that the version of watchOS does not have a public beta version, but in this case the developer version was released days after launching with macOS, iOS, iPadOS and tvOS.
The new versions released appear to us in the form of a normal update as soon as we enter the settings of our devices and in this case the important thing is to catch up with them as soon as possible since improve stability, security and some bugs that we have in the current beta versions of the OS.
It seems that these versions add corrections and little else, but in some cases they are quite important since the betas have many bugs with apps, functionalities and others. That is why we always recommend staying away from the beta to avoid precisely these failures and in case you want to install them, wait for public versions and always do it on devices other than the main ones.
In the case of watchOS 6 beta 5, the improvements also focus on improving the stability of the watch, improvements in fluidity and security. Developers already have this version available directly from Apple's developer center and can install it directly from the iPhone Watch application. These updates above all improve the stability of the OS, few improvements add directly in terms of functions.