Best Priority Settings for Quest Watch?

[Azelius]

Hey there! First of all, kudos on this AMAZING addon. It's all a wowcaholic like me could need to level all his precious little alts ^^. Anyways, I'm kind of confused by how the quest watcher handles priorities. If you guys could tell me the best ones to use for leveling, I'd be eternally grateful. And explanation on what each one does wouldn't be bad either. Thanks ALOT !