SSB is rock-solid in that the community encourages the use of diverse client and server implementations rather than having a monolithic interface that's meant to do everything.

On the other hand, the underlying libraries are opinionated in that they usually use depject and a handful of other tools/techniques that aren't super familiar to those outside the SSB community, which makes it harder to write brand new clients.

I'd use SSB exclusively if they offered a web client (as I'm on a Chromebook), but we're slowly getting there.