I wear crew neck or henley t-shirts.
In the cooler weather, I'll wear crew neck t-shirts but during Summer ? It's tank tops all the way !
I like all three, depending on the weather and the rest of the outfit.
Crew neck or V-neck. I have a lot of shirts that are of both types. I don't wear tank tops really ever, though.
It depends on the situation. T-shirts are the most comfortable but Tank Tops are great for certain outdoor activities.