what is the defrent between unofficial and official dolphin emu

[KHRZ]

Official releases will usually be more stable and not have all the temporary errors that appears during development, like games getting broken for a while, everything that have ever worked should work in an official release. Also there's a list of features they try to complete untill the next official release. The last official release now is really old, so it's better with the latest unofficial "releases" (The source code is open, so people compile new Dolphin revisions all the time, the release on the Dolphin homepage is for the people who doesn't know that)