Initially I was too unsure of what the stats even did being a relatively new player..... I've only made Warrior and Dark Knight builds thus far but I'm pretty sure the builds will be the same.

Strength Heavy Warrior to the MAX as I already have a veritable bucket load of HP something in the region of 8.7K without Thrill of Battle, 10.8K with Thrill and no other defensive buffs. Having more damage at this point seems more or less like the only real choice.

Same goes for Dark Knight though I'm likely to make more of an investment in Piety, which as I understand it buffs total MP, and with more MP mean longer Darkside and more upper tier spell wiggle room.