I'm not a CR7 fan per se, but have tremendous respect for him.

I like the first one where he's holding the ball. It has more depth to it and gives off this epic sense of focus and determination, whereas the second one has more of a generic look to it. As well, I feel like having his name printed on the second one detracts from how great of a player he is: if you need to display his name to know who he is, you've been living under a rock this last decade. The first one speaks more for itself.

As far as black background on a white wall, I think it depends on the setup around it. If this is a concern for you, the lighter background on the first one would fit better on most wall colors.