Best weapon options for Sky Lanterns?

I recently bought two Sky Lanterns for my Grand Cathay army, and I'm looking to figure out what the best weapon options are to take for them.

Crane Guns seem strong, but the move and shoot for Iron Hail Guns also sounds cool. Between the two types of bombs, are the Gunpowder Bombs or Dragon Fire Bombs better?

If it helps, one of the balloons is going to carry a Lord Magistrate, who is also my general.