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57 x 28 or 9mm?

I'm on the fence and am trying to consolidate ammo for when shtf. I just got the Smith and Wesson M&P 57 (no safety, of course) and its out performing my S&M MP 9c on penetration and accuracy...but the ammo is super expensive.....plus its not a common round. I'm wondering if I should stick with the 9mm for those two reasons? side note: the green tip 57x28's penetrate class 2 body armor and they will put a serious hurting on class 3.

I'm on the fence and am trying to consolidate ammo for when shtf. I just got the Smith and Wesson M&P 57 (no safety, of course) and its out performing my S&M MP 9c on penetration and accuracy...but the ammo is super expensive.....plus its not a common round. I'm wondering if I should stick with the 9mm for those two reasons? side note: the green tip 57x28's penetrate class 2 body armor and they will put a serious hurting on class 3.

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The consensus seems to point to a 16" 5.56mm all-rounder, long-range .308, and a .300 BLK SBR. Urban and forest environments may change that, and so would fielding in rural areas, where a longer-range bolt action would be perfect.

5.7 is only great with AP ammo, and 9mm is widely available. Id say get both if you can and branch off later depending on what you feel most comfortable with later.