When I'm upset I'll drink my comfort tea: decaf red rose from tea bags. It's not because it's a particularly spectacular tea, it's because it was my comfort tea growing up. Whenever I was sick or upset, my mom would bring me a mug.
Comfort aside, when I'm in a bad mood I'm more likely to gravitate towards standard black teas like Irish Breakfast or Earl Grey. If I'm happy I'll drink one of my flavored teas like a custom pumpkin spice blend or cherry black.
Of course, that's because it's winter now. If it were summer I'd be going for my greens and whites - I find the type of tea I drink depends a lot on season too. In fact, my greens go largely untouched all winter just because I prefer the heartier blacks for the gray and cold weather.
Oolongs just seem to be for whenever I'm in the mood to drink one!