Depends on a lot of things, actually.
If I'm having a dark roast, I'll take it black. Might as well enjoy the texture. Even more so when it's cold. I try to avoid the extra calories if possible. This is my go-to 75% of the time.
If some average-ish weaker brew is made, or it's 80+ degrees outside, or my stomach has been doing barrel rolls, then I'll take it with cream (about 1 tbsp) and maybe a little sugar, though not enough to turn the stuff and lighter than a medium beige. Or perhaps if I need to drink a cup and be done with it very quickly (like right before the airplane takes off).
Exceptions for the really dank stuff; something that's been on the warmer too long and starts to smell like burnt road tar. More sugar and that awful powdered creamer which looks like ground-up drywall might be necessary on long nights.
At that point, I'll just pop for an energy drink. Same if it's just nasty hot outside and I need a pick-me up. Or look for some tea.