About The Same!
dont be fooled, like i was two years ago, when buying my first pistol. my first pistol was a 9mm over a .40, cause i read all over the internet that "the .40 is just to powerful", "the .40 hurts my wrist after 50rds", and "the .40 is so darn near uncontrolable that accurate follow up shots are very difficult to do". thats is all just bu!!****. the .40 is not bad at all, and does feel about the same as a +P 9mm. and if you use this gun for CCW, you would probably use +P 9mm any way (which would kick like a .40). so just get the .40 for defense, the only bad thing abou the .40 is the price compared to the 9mm. i have a USP 9mm, and a USP .40 slighty more recoil with the .40 (but still very managable). i own the GLOCK 17, have fired the GLOCK 22, and felt about 5%-10% more recoil with it then compared to the GLOCK 17. so go for the .40, and get mo' power!