Shock for me.

I carry a staff of both Paralyze and Soul Trap on my main Mage. I found a staff of Soul Trap on a random critter while in an Aylied Ruin so now I just carry both of them. Paralyze is fun, even more so againest rats or Goblins when they are in mid air jumping towards me. Normally I only use my Paralyze Staff so that I can Paralyze something, swap to my Soul Trap staff then blow them apart with some silly spell. Only ever time I use it is to runaway, and thats even rarer.

Always Paralyze