It depends on the type of ship I'm about to shoot and where I am.
I needed a couple of Chemical Manipulators for G5 FSDs earlier, so shot a couple of traders in an anarchy nav beacon. Their bounties (if any) are rather low, so there's no point in using a KWS. There are no asteroids the (harmless) pilot can run into, the fighter gets around faster than the Corvette, the firepower is sufficient to kill Haulers and Lakons and it's fun to fly, so why not? Besides the Corvette has 2000 MJ of shields and since I was going for traders, there wasn't any stiff opposition.
In a Haz RES, I certainly would stick to the main ship.