I think it would come down to convergence and length of the burst you can put on target StSanta. If the target was fast at a high deflection angle, you've a better chance of killing him with the cannons I think. You might hit him easier with the Jug, but chances of a kill or a cripple are low with that kind of shot.
A snapshot with the target in the bullet stream for a bit longer and the Jug will do leathal damage. So would the FW, but it would be an easier shot in the Jug with the .50's great trajectory.
BTW guys, I think this all boils down to what roll you put the plane in. At below 15k, arena altitudes, the FW holds all the cards. The FW can disengage with a bit of skill and the Jug can't. All the FW driver has to do is scissor to slow the Jug down, then flick away and accellerate for an exit. I've had good FW drivers do it to me when flying the Jug and the Hog. The FW driver can dictate terms, the Jug can only hope the FW is stupid enought to try a stallfight.
In the arena, the FW is slightly superior IMHO. In a scenario, or other high altitude settings, the Jug will win the day. I think your tests bear that out pretty well.
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Lephturn - Chief Trainer
A member of The Flying Pigs
http://www.flyingpigs.com "A pig is a jolly companion, Boar, sow, barrow, or gilt --
A pig is a pal, who'll boost your morale, Though mountains may topple and tilt.
When they've blackballed, bamboozled, and burned you, When they've turned on you, Tory and Whig,
Though you may be thrown over by Tabby and Rover, You'll never go wrong with a pig, a pig,
You'll never go wrong with a pig!" -- Thomas Pynchon, "Gravity's Rainbow"