You guys keep talking price when the diff is $7 per box for carry ammo. So that is not a reason to go 9mm +P+. Yes, std vel practice ammo is cheaper in 9mm, but then you are not practicing w/ something equiv to your carry ammo, if that is a concern. If you handeload, the cost is almost identical between 9mm & 357sig & you have options w/ the 357sig you do not with 9mm. Just a though.
"Given adequate penetration, a larger diameter bullet will have an edge in wounding effectiveness. It will damage a blood vessel the smaller projectile barely misses. The larger permanent cavity may lead to faster blood loss. Although such an edge clearly exists, its significance cannot be quantified".