JapanMS - Open-To-All Test Server; May 16th ~ 30th

Berserk or Combo. Depends on whether you like the other Dark Knight and Hero skills on which one you go with.

Combo/Adv. Combo are insane boosts in damage (200% total damage with Adv. Combo), and work with any weapon type the player can equip. I'd probably go with those.

And cause I forgot which mule this was on, SS...

 Spoiler

The level 120 Lunchbox, of course, is better. It has 109 atk and it's faster.