How is the Oculus as good as Heart of the Oak?

The Oculus

+3 Sorceress To Skill Levels
+5 To Mana After Each Kill
All Resistances +20
25% Chance To Cast Level 1 Teleport When Struck
30% Faster Cast Rate
+20 To Vitality
+20 To Energy
+20% Enhanced Defense
50% Better Chance Of Getting Magic Items

Oak has 10% faster cast, max mana, and possible 40 res all. Now, I know 20vit and enhanced defense are nice, but how can they compare with 40 res all?

And yes, this would also be great for any pure casters.

Also, I don't like mf anymore. I don't mf normal monsters. I do runs like everybody else does... and... since the mf doesn't work on superuniques, why even have it on?

What is it they say about silence being golden?