Genders.

Well first off, i think women have it tougher.
They have to have babies! hah. Also its tougher for women in the working world.
Men are generally better at physical strength then women. Typically women are more caregivers then men. Women are also more dedicated. Sports wise men are better, usually.
When it comes down to who is more dependent, or who is worse off alone i have no idea.
Thats hard to say.