basically this all boils down to...."to each his own"
some people like power
some people like speed
i have been shooting all of my life, i served in the army and now i am in the air force...i carry a glock 19 for personal protection, and i carry gold sabre 147 grain JHP...as long as i am within 30 feet my bullets go where i want them...i have been trained as such...
that said...
the average law enforcement officer has a 25% accuracy rating....meaning one in four shots will hit the target...(most cops are better than this its just an averaged number, not dogging on the police

)
and the cops are trained sooooo if you are not a cop or a soldier you might want to have a firearm with more rounds...a gun is a gun...and it can be frightful....ever stare down the barrel of any weapon?! if a gun is pulled on me im not going to look at it and go oh thats a .45 im going to run off, or say oh thats a 9mm im not scared! if you want a big bullet and a big gun ok if you want a small bullet and a smaller gun ok...to each his own!
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We live so others may die!