My question is:
is 15% poison skill damage better than -10% poison resistance? or is it the other way around?
Any help/information would be greatly appreciated.

+5-15% to Poison Skill Damage or -5-10% to Enemy Poison Resistance
+14-25% Better Chance of Getting Magic Items or +20-55% Extra Gold from Monsters
+10-65 to Life or +10-75 to Mana
+5-10% Faster Run/Walk or +12-24% Faster Hit Recovery or +3-8 to All Attributes
Magic Damage Reduced by 5-10 or Damage Reduced by 5-10