There's no magic bullet. Even the renowned manstopper .357mag will 'fail' at times ie. it's good but not magical. One benefit of the .38 is that there's lots of cheap good ammo - and the .357 can fire .38's too. At a certain point, bullets end and shot placement begins ; the .38 provides enough bullet. The .38 is a great round for someone to try to master ie. practice practice practice...
Fixed it for you.

No matter what caliber you're using, the one overriding factor in winning a gunfight is shot placement. Putting your rounds through the heart or CNS will shut down the fight in short order.