Both are correct; there is little difference in meaning - may would say they are equivalent, although an exact speaker might say that the first implies he is focusing on the son, the second that he is focusing on the playing.
may would say they are equivalent
centrox wrote:may would say they are equivalent
A typing error - that's "many would say".
I have replaced "man" with "father" in the second sentence. Does it make the relationship between the man and the child clearer?