The long copy vs. short copy debate always seems to be raging. I have a really succinct answer for the question “which works better?”
What we generally refer to as Occam’s Razor is more appropriately classified as the principle of economy. That principle states that “it is futile to do with more things that which can be done with fewer.” We could say “it is futile to say with more words that which can be said with fewer.”
In other words, get to the point! The quicker, the better.