i recommend avoiding determination for a rookie leveling because usually these players do never profit from it
also, in leveling there are plenty of singletarget situations
usually the enemy is dead before the 100% are reached, even with strong items etc
because of this proficiency is better
leveling items are only with prof/det/brut and vit/bloodlust, correct
exception are items that drop from enemies, they have willpower
... but as always, its only a recommendation, everyone can form a good picture with the infos gained from here and thus decide what fits him most