Elemental Shaman, Crit v Spell Damage

Hey so noob question.
I picked up a 2% spell crit trinket on the same night that I picked up a 29 spell damage trinket. (eye of the beast and briarwood reed)
From what I understand the 29 spell damage trinket is significantly better from what everyone says.
For an elemental build. Should I pick up the Royal Seal of Eldre'Thalas, which gives 23 spell damage, over the 2% spell crit?
Keep in mind I have Elemental Devastation which gives me an 100% chance to deal double damage on crit.
My friend who is a mage says that spell damage is always king, I just want to know how much crit is required before spell damage is dethroned for a shaman.
*Edit: Mind you this is for PVP
I picked up a 2% spell crit trinket on the same night that I picked up a 29 spell damage trinket. (eye of the beast and briarwood reed)
From what I understand the 29 spell damage trinket is significantly better from what everyone says.
For an elemental build. Should I pick up the Royal Seal of Eldre'Thalas, which gives 23 spell damage, over the 2% spell crit?
Keep in mind I have Elemental Devastation which gives me an 100% chance to deal double damage on crit.
My friend who is a mage says that spell damage is always king, I just want to know how much crit is required before spell damage is dethroned for a shaman.
*Edit: Mind you this is for PVP