Storm Sheild or Zakarum for fant Pally?

i have a lvl 72 fant pally who is having more trouble than he should be doing baal runs. I have fant, holy sheild, and zeal maxed. I hav e guardian angel templar plate and a tomahawk axe. He can usually kill pretty easily but he dies alot when there are alot ofo spell casters around. His ressitances are good about around 25% or higher with the shield i have now. I was wondering which shield would better suit me as i continue to hell and which shield would hlp me not die more often.