Think in a room where we teleport two member enemies between them, at the same time. Which race will win?
Mantis has more damage, but Rockmen have more life. Lanius will remove the oxygen of the room before they die in a fight, suffocating enemies, but Crystal members have suffocation resistance.
Zoltan, Engi, Slug and humans will always lose, I think. But between each pair of the rest what would be the result? Maybe when skills are maxed there is different results?
So which is the best race to fight against what?