AMD's APUs (the processor that start with the letter A) are not good for gaming, unless you want low settings in a low power environment, like on a laptop. It seems that you are looking at laptops, so you'll need to look at some of the other information to decide.
If the laptop has a discrete video card (one that's not part of the processor), then the i3 is going to be much better than the A6. However, if it doesn't have a discrete card, then the A6 wins because the GPU it has built into it is much, much better than the one in the i3.
That said, I doubt either one of those CPUs will be able to have decent performance at or near max settings in those games, unless paired with a discrete card.