General

Vengeance or Concentrate?

Hey,
I got maxed SE, Hurri, Bow Expert, Marksman ship and 20lvl maple warrior. 1stlvl of Dragon and 1st lvl of phoenix and now ...
I am going to put some SPs into new skill.... put 10SPs (max) to vengance or 10( 10/30) to concentrate?

Vengance could give me an extra dmg during train or bossing(zak arms for example) and concentrate could give me back money for attack pots... echh ;/ i think better idea is max Vengance 1st but i want to be sure :>

Thanks for help,