Stamina damage usually since bringing target to -100 sta kills them outright
if you have bloodlust the hp damage won't usually outkill the sta damage unless you have around 55+ combat investment
also the bloodlust damage is compared against defense rather than constitution
the arousal damage doesn't really do anything to enemies other than increase semen output "I think.. don't quote me on that. Might not be true but I am going on anecdote involving semen farming where bloodlust semen is usually way lower than sta damage semen"