Empoleon vs Daikenki
With the advent of Black and White, Empoleon was succeeded in the Water Starter role by Samurott. Much like with Feraligatr, the two have some similarities, namely the similar special attacks. Samurott's also faster, but Empoleon has better defenses.
So, who'd win?
Who's your favorite?
Who's more useful?
I'll vote for Empoleon here. I come to this conclusion for two reasons. Number 1, the two of them are pretty evened out when it comes to stats and though Samurott has better Speed and Attack, Empoleon has MUCH better typing. The Steel/Water combo is unique and it gives Empoleon a list of twelve resistances (if memory serves). This thing can tank even when it doesn't mean to. Number two: It's a bloody penguin. How can you say no to that?