9mm vs 45, a simplified explanation

Thanks to Lane of raider applied training and tactics for a good explanation of this old debate.
Here is a link to his YouTube video.
http://m.youtube.com/watch?v=Ebz0jdDnrR4&desktop_uri=%2Fwatch%3Fv%3DEbz0jdDnrR4

Find him here https://www.facebook.com/pages/Raider-Applied-Training-Tactics/583248001721264