It is wrong to say that one is lacking of the other, I think RangerG covered that before. They are different in some ways, Krav In the US was enhanced to be used for the people and the situations of the United States. Israeli Krav was designed for Israel. That's the difference, one is not better then the other. It's a matter of what you are looking for out of the system.
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If your in a "Fair Fight", your tactics suck.