The blossom mage does have some advantages (on paper at least):
- Has lower weight, meaning you can fit more into squad than you can with priests. As a result, a squad of blossom mages has higher damage
- Has higher initiative
- Is better vs heavy melee units.
While the priest advantages are:
- Has higher health
- Has stronger special abilities
- Is better vs heavy range units
If you were to fill a
squad size of 12 units (4 blossom princesses vs 3 sacred priests, both tier III), then here's what it would look like:
The same looks to be true of other tiers of these troops.
Disclaimer: I have not actually fought with blossom mages yet.