My guess is that Mr. Macho online practices with his .45 much more than both of his .40's, which is why he's ''better'' with it.
Or Mr. Macho is an Internet gunsel just blowing smoke. This is the Internet, after all.
If you're wondering whether to get a .40 vs. something else, the answer is "maybe, if it's big enough." There's a lot of other factors involved.
"As was the man of dust, so also are those who are of the dust, and as is the man of heaven, so also are those who are of heaven. Just as we have borne the image of the man of dust, we shall also bear the image of the man of heaven. "