I like the 45ACP a lot because it is bigger! Sadly all the info seems to show that an imaginary bad guy holding his pistol pointed at you and ready to fire and you fire a shot "if" he is shot in exactly the same place with a 230 grain 45 caliber GDHP or the 147 grain 9mm GDHP he will have the same 4-5 seconds to try and kill you regardless of which caliber. I am not selling my 45's but am thinking of trading a model 17 for a VP9 and a few spare magazines.