Empoleon would be my choice. It has that electric resistence, after all.
Empoleon is more useful; to me, at least.
I'd say that Empoleon would win, too.
Empoleon all across the board.
Starters of choice.
Claimed Volcarona on 03/04/12.
Which one do you prefer?
I voted for Feraligatr. Empoleon may look like a sir, but Feraligatr just looks a lot more badass to me. I like his moveset better too.
Which one is more useful overall?
I wouldn't vote for the guy if it was useless. Feraligatr may have less resistances and less choices with Water-type attacks (being a physical attacker and all), but choosing this guy as my starter in my SoulSilver version was a choice I'll never regret. It stood it's ground pretty well against Red's monsters after all.
Which one would win in a battle?
That depends on a lot of factors, but I think Feraligatr has the upper-hand on this. It can bash Empoleon with a good Superpower or Earthquake attack. What can Empoleon do? Grass Knot? Perhaps, but that doesn't seem to be enough to down a well-trained Feraligatr.