Straight from Electricity Damage that Lightning Bolt/Ball references.
Electrical damage is treated as Stun damage and resisted with half Impact armor (rounded up)metallic armor, however, offers no protection. The nonconductive armor upgrade (p. 327) adds its full rating to the armor value.
-SNIP-
Electronic equipment, vehicles, and drones can also be affected by Electricity damage. They never suffer Stun damage, but they do roll Body + Armor (drones and vehicles) or Armor x 2 (other objects) to resist secondary effects.
Electrical damage is always treated as stun damage. A spell can either do physical damage or it can do electrical damage, but it can't do both. Doing electrical damage automatically changes it to being treated as stun damage. So the chain of events goes to spell starts physical, triggers electrical element, and immediately gets converted to stun.
Most likely an oversight on the dev who wrote it's part, but the bolded part specifically states Electrical Damage is treated as stun. It doesn't say all electrical damage but that caused by Lighting Bolt/Ball, and Lighting Bolt/Ball specifically state they deal Electricity Damage and reference the section my quote is taken from. You can claim that the Electricity Damage segment is wrong, but honestly which is more likely, the electricity segment being wrong (and impacting all current electrical sources to physical) or a single letter in the spell description.
If the vehicles armor is completely metallic, then it's going to be rolling considerable fewer dice to resist against the lightning bolt which is a point in it's favor (most vehicles should have some shielding to electrical attacks in 2072, but I'd probably throw in an extra 25% reduction). Lots of military/law enforcement drones should have non-conductive as a special armor mod. Especially anything that flies (as common as stick and shock is, it would be a hazard not to). Yes, most drones are going to get toasted by it, but decent sized vehicles probably won't.
It really just comes down to play style and preference. If you run into lots of vehicles, take an elemental spell like Frost or Acid. If you don't run into them often, power bolt is nice and you always have edge for when you absolutely must one shot that damn drone/chopper. Or at least, hopefully you have edge. I highly recommend edge, it's a runners best friend.