Kennen or Darius

hmm

if you have to ask then just get darius. It doesn't matter what the difference is. Kennen is not something you should play ever if you have to ask anyone else if its a good idea. Sure, kennen performs just fine. Darius can too, its not a matter of difficulty, just of function and purpose. Don't pick kennen if you have to ask. Darius is more of a general pick

Darius is much better if you need to ask simply because he provides the survivability to carry while Kennen is more of a "player playstyle" suited champion

both are easy to carry with, but only Darius provides that frontline and all-round stats for players who are unsure what to play

Kennen's fun and reliable darius is dull and relies heavily on the enemy making mistakes. Darius's only good for his ultimate in late game team fights