Depends on the time. In the morning I prefer to drink tea. But when I'm working until late at night, I prefer coffee.
It depends on the mood here, but I prefer sweet on both. More cream & sugar on my coffee and iced tea or green tea with some sugar.
I would rather prefer the tea, especially the green tea, which I need to drink at least 3 cups per day!
Tea. Why? I tried Coffee a very long time ago on a plane & it tasted like absolute crap, never gonna have it again!