Lexie, I'm a real codie, and I was studying this again today. The light one on the right before, I think it is too close in color to the back splash to really compliment that. I think I would want a color that just draws my eye right to the back splash, and that would be one of the darker colors.
Now between the darker colors, I actually like them both. One would be more of a neutral, (the grayish green) even though they are both neutral, and I think I am leaning towards the first one again (the green one) that one would be more like adding in another color into the kitchen, but and there is always a but..........
Since I can't really see the colors that well, I think I would go with the one with more of a texture, meaning the speckles in it. It's the speckling that will hide the coffee rings better.
And this is why my contractors hate to ask me to make a decision. (lol)