I've never really tried it. I don't really know. I shot an AR15 type airsoft once and it was fun, but when I looked at the price tag I figured that I'd rather have the real deal. I also played with airsoft handgun with friends doing gun disarms. That was fun, but not as threatening as a simunition because there's no bang and no pain involved.
On the other hand I've played with simunition handguns against a knife charge, in clinches, and force on force. The pain factor motivates you to do the right thing. I vote for simunitions.