I prefer Zebstrika.
For starters Zebstrika has a great ability - Motor Drive or Lightningrod. Both of them absorb Electric-type moves and raises Zebstrika's Speed or Sp. Atk respectively. Though Electrode doesn't have the best abilities, Aftermath is pretty good when combined with Explosion. Though assuming this is in-game I'd imagine this would be hard.
Secondly, Electrode's stats aren't all that great. With the exception of his through-the-roof speed, his highest base stat is 80 - not very good, for being a maximum. Zebstrika has a tiny saviour; it's base Attack is 100, however Zebstrika's only great physical Electric move is Wild Charge, so that's a bit of a downside. However Zebstrika still gets other physical moves.
On that note, Zebstrika and Electrode don't have very vibrant movepools, but at least Zebstrika has a more vibrant movepools than Electrode, so that's enough there. Zebstrika's Ion Deluge is also an interesting move.
I'm looking at this on an in-game perspective btw, since I just think you are referring to in-game. If you're talking competitive I'll hide this. :S
Hope I helped. :)
Sources: Serebii's pages
