First off, check this link out:
Now, of all three Pokemon electrode has the lowest hp, atk and def, spatk and spdef, and base stat total. Actually the only thing he excels at is speed, which in my opinion is not nearly as important as the other stats. I would, under no circumstance, choose electrode.
Zapdos has better move resistance. Ground type moves do not affect it in any way. If you have lightning rod ability, you take 0 damage for electric moves AND your SpAtk is raised. Grass, Fight, Steel, bug, and flying type moves aren't very effective against it. The only types that are super effective is ice and rock. Zapdos has a higher SpAtk, which is extremely important with electric types. It also has a higher defense, which will help alot considering most Rock type moves are atk instead of SpAtk. . It has a lower atk, but that will not affect you if you use special moves instead of physical, which you should be doing with zapdos anyway. My main concern with zapdos is its lower defence(sp. and normal). However, since its a legendary, its defense is still above average. Its speed is lower, but speed is near useless. However, now we have to add in Nature. Your jolly nature means that you SpAtk is lower than raikous...by 1 point. So we can consider them tied.
If your Raikou has Volt Absorb ability, then thats awesome. Being hit by electric atks don't hurt it. Actually, they heal him. However, its type resistances are worse, since he is resistant to only electric, flying, and steel. To counteract this, though, he is only weak to ground. He has a better move selection, which means he is more flexible. However, when it comes to having the best moves, they both qualify, which reminds me, why does your raikou not know crunch? why? Anyways, your Raikou's defense is low, especially for a legendary. This is especially bad since his weakness is ground type and most ground types have higher atk and most ground type moves are physical. However, its SpDef is much better. It also looks cooler.
All in all, I would go with Zapdos, even with the Jolly nature. Its type resistance is stellar. However, a few tips concerning your moves: when you start getting into the better moves, ditch fly. It is a physical attack and your Zapdos has a low Atk. Sure its has a 90 in power but your SpAtk is 30 points higher