Are built based on source code from the Community build branch which has been released and tested
This build undergoes additional and longer testing cycles
Builds are made by /e/OS using the /e/OS build infrastructure and signed by /e/OS stable keys
A so-called “stable” aka “official” is nothing more than “tested” d/e/v builds. I would not overestimate the quality of the build, because the “community” builds usually run just as well.