Theoretically either style should work; in the real world however, better accuracy and cycling of the firearm occur when the pistol is held in the traditional manner. Believe me, if shooting "Hollywood style" was any good, it would have been adopted by shooters long ago.I have a question for you gun experts.
I have only ever had an old farmers percussion cap shotgun and had a go with a Remington pump on a range so am a bit of a know nothing about handling guns.
OK, there is a new film out with Mel Gibson, as with many films these days the actor 'Fires' his pistol holding it sideways rather than butt downward. Is this a movie makers piece of fiction or does using an automatic pistol in this way have any standing in the use of firearms