Coin toss.

Who's going to crack up first? Catherine is a more natural optimist, and better at living in denial, but she's been pushed to a point of desperation. Susan lives on the edge of sanity as it is, and doesn't need much of an excuse to dive into the deep, dark waters of depression. Susan's more likely to explode, Catherine's more likely to weep quietly. Susan's more likely to withdraw and quit trying altogether, Catherine's more likely to pretend everything's okay until it's too late. Susan's tired of dealing with the pressure of being the household income savior, Catherine's overwhelmed by her job and her school and her half-crazy wife. Who's going to win the race to hopelessness? It's a 50-50 proposition right now, and it could go either way.