All Plex plugins are maintained and supported by a community of volunteers. If you want to find a list of plugins that are most likely to work with your Plex app, work most consistently, and are regularly maintained, those would be the plugins that are listed in Plex’s Plugin Directory. The Plugin Directory is accessible from the Plex Web App by selecting Plugins from the left sidebar and then the Install Plugins button.
Plugins available through the Plugin Directory are considered stable, typically work on a majority of apps and do not contain content that may be considered offensive or questionable. But even these plugins are still maintained by the community of Plex plugin volunteers. Because these plugins are considered to be more stable, they are easier to maintain and update, so multiple plugin developers may provide support, updates or fix issues.