The problem with the damage enemy option is that it lowers to 1 the hp of only the first unit in a stack, once that unit is dead the next unit starts with full hp. If you use the cheat on a stack with 100 units and do enough damage to kill exactly 10 then it will kill the one with 1 hp then 9 more and the top unit of the stack will have 1hp left. The super health option however effects all units in a stack. I learned this because i accidently used the super health on an enemy stack and then had to use the damage health option to kill them by reducing each one to 1 hp, killing them, then reducing the hp of the next. This takes a long time on a big stack.