Stats
Eelektross
>HP: 280 - 374
>Attack: 211 - 361
>Defense: 148 - 284
>Special Attack: 193 - 339
>Special Defense: 148 - 284
>Speed: 94 - 218
>Total: 515
Electivire
>HP: 260 - 354
Attack: 225 - 379
Defense: 125 - 256
Special Attack: 175 - 317
Special Defense: 157 - 295
Speed: 175 - 317
Total: 540
Electivire clearly has better stats at first sight, reaching 540 while Eelektross reaches 515. Eelektross sports a better HP, but only by twenty points. Electivire slightly wins out by about ten points in the area of attack, but loses by thirty in Defense. Eelektross's Special Attack wins out, roughly fifteen points while Electivire wins in Special Defense with ten points. Although Speed is where Electivire shines ahead of Eelektross. It's speed reaches a hundred points higher.
__
Typing
Both are electric types, having the same weaknesses and strengths. Not much to discuss here except that they'll both be crippled by Earthquake...
__
Ability
Levitate for Eelektross and Motor Drive and Vital Spirit for Electivire. I say Eelektross wins out in the Ability area as Levitate lets it overcome it's only weakness, ground. Eelektross so far is a better choice, except for it's speed crippling it.
__
Coolness
Just kidding, just kidding!
__
Movepool
Eelektross
What movepool? But seriously, it can learn quite enough STAB moves and other powerful ones, a few examples being Discharge, Dragon Claw, Thunderbolt, Flamethrower, Acrobatics, Rock Slide, Dragon Tail, Flash Cannon, Giga Drain, Iron Tail, Aqua Tail and Superpower.
Electivire
He has a majority of electric and fighting moves in his set, but good moves include Fire Punch, ThunderPunch, Discharge, Thunderbolt, Earthquake, Dig, Psychic, Brick Break, Flamethrower, Rock Slide, Cross Chop, DynamicPunch, Hammer Arm, Ice Punch, Iron Tail, Signal Beam and all those are pretty good!
__
I guess I would pick Eelektross.