Some math
40 spitters (420 manpower cost killed)
[ranged] 7 skirmishers, 1 bowmen, 5 hoplites, 5 cavalry, 86 spearmen, 1037 slaves and this
This is 0.017 skirmisher, 0,002 bowmen, 0.012 hoplites, 0.012 cavalry, 0.204 spearmen and 2.469 slave per unit of manpower.
On the same front 8(14 manpower) hunters killed 3 spearmen, 26 slaves and this is 0.21 spearmen and 1.85 slave per manpower
If we assume that hunters do absolutely nothing in skirmish\melee (unlikely), they are worse in killing slaves but roughly equal in killing spearmen.
It is hard to evaluate their effectiveness against stronger targets because they are too few of them. If they are as effective as spitters against skirmisher, then it would be 0.204 total and this is simply not enough.
Spitters do kill one stage earlier and have far better attrition rate and probably producing 10% more of them is
slightly better than producing
unupgraded hunters BUT if we keep spitters as nat effort, we retain their strategic mobility to use them on any front we want.
I insist that we should double upgrade hunters and then raise their producion rate from 2% to 12% Edit: It is not 8, it is 6 hunters, so hunters are actually better in killing both spearmen and slaves. (0.285 and 2.476 vs 0.204 and 2.469)
I think I should leave those to 10ebbor10...