Here are the greatest hits
Going by mob level, not recommended level, like always. (Fairly accurate mob levels.)
- (20-22) Wetlands - Mosshide Gnolls/Mongrels - the most beloved low-level spot
- (24-28) Duskwood - Raven Hill Undead - watch out for Mor'ladim
- (28-29) Duskwood - Nightbane Worgen (various types) - big aggro range, fast run speed, some casters to avoid
- (33-34) Arathi Highlands - Go'shek Farm
Other than that, same spots as Horde
Alliance options for 14-20 overall are worse than Horde's.