Even though I barely remember why I moved here, libranet is now the main I've had the longest. It has performance issues sometimes, it needs to periodically close for db backups, the UI has its fair share of quirks, but I feel really at home here.
Life is slower and more thoughtful in the conversation-oriented Friendica model, compared to the more microbloggy and hectic Pleroma, Mastodon and *key worlds. To me, anyway.