Crew Neck or V-Neck?

[rossination]

You are getting dressed in the morning and you plan on wearing some sort of a collared shirt. Do you put on a V-neck undershirt, or a crew neck? Why?

I've heard many people say that you always wear a V-neck, as having your undershirt showing is as bad as having your underwear showing (eek!), but I like the look of a white t-shirt underneath a dress shirt (think Michael Bluth in Arrested Development). I feel goofy whenever I wear a V-neck undershirt, and much prefer the crew neck undershirt (like a T-shirt). I also like to wear colored shirts under button up shirts, so I very rarely wear white undershirts anymore. Regardless, the question is still interesting...

EDIT: James brings up a good point: there is also the option of the tank top / A-shirt / "wife beater" style undershirt.