All depends on the current and depth on the particular day you are fishing. On average, I would say that a 14-16 oz jig is the most commonly used. I usually carry jigs from 14 oz all the way up to 24 oz., although you rarely have to use them that big. But if you do need them, and you don't have them, then no fish for you...lol.
As for jigging producing more than bait, again, it all depends on the day. I would say that the further north you go, there are more cod caught on jigs, but that is because jigs are more popular than bait up htat way. I don't know why, but that's the way it is. I've had days where bait worked better, and I've had days when jigs worked better. There have been days when both were equally effective. So you never can tell. Best bet is to try both, and see wich one works better, and stick with that.
And as for light sticks, I've never tried them, and have never seen anybody try them. Maybe someone else can help you out with that.
Any other questions, please feel free to ask, or you can even e-mail me.
Hope this helps.
~tight lines~
~spinfreak~