I'm a solid B. I'm generally a fan of color and especially like @TAMAnnoying said, a color icon/cover is much more likely to catch my eye than a BW one.
Buuuuut I also read plenty of Black and White or gray scale comics too. Ultimately I care more about the story than the art rendering, so long as the art is clear and easy to read/understand. Some gray scale and black and white comics have such poor contrast or form definition that it can be difficult to understand what's going on in a panel. But on the other end of the spectrum, it's just as possible that a color comic has awful/hard to look at color choices. So like, yeah it doesn't matter too much (to me).