Zombie knife advice

[hoepoe]

Esteemed Members

As part of my doomsday preparations (tongue in cheek description, but seriously planning), i'm looking for a versatile knife that would be useful in both bug-out/huckle-down type scenarios. This will not be used as a day to day carry knife unless the proverbial really hits the fan.

I've narrowed it down to three (in no particular order) and would value your opinions.

1. Green Beret (which length?)
2. Pacific (Civilian model)
3. PS.com

Thanks

Hoepoe