Welcome Preppers and Survivalists,
Pearson Scott Foresman
Firearms are tools, just like any other tools.
For most preppers, a .357 magnum revolver is going to be 'good enough.' They are inexpensive, don't require expensive magazines, take commonly available ammunition, and are rugged, kinda.
Say Uncle - But I read on the internet that revolvers were always reliable
Needless to say, ...
Some tools aren't appropriate for all situations, so you might need a different tool.
Shooting Illustrated - The Drawbacks of a Subcompact Single-Stack 9mm
I did not just give you permission to go out and buy a bunch of guns ; - )