Just to clarify,
Spell Hit Rating - Increases the chance your spells will hit the target.
Hit Rating - Increases the chance your melee attacks will hit the target.
They are two different ratings. So, unless you are melee, you dont need hit rating, you want Spell Hit rating.
EDIT: Sorry, did not address your question Zebug.
I am not 100% sure about that, but Suppression gives a chance your spells will not be resisted, with a spell hit rating, it would most likly be that your spells would be given a higher chance to not Miss the target.
But I dont think I have seen a spell 'Miss' a target before, just resisted, unless it refers to Shadowbolt, Shadowburn, Searing Pain, and the other spells that give burst dmg. I will try to research and give you a clearer explination.
Edited, May 17th 2007 11:14am by cykoman