Eye of the Storm is more pvp, while Elemental Rage is for pve. Ele Rage also does more damage compared to EotS and the base skill.
For the love of Kyne, buff sorc. PC NACP 2100+Star-Sïnger - Khajiit Magicka Sorc - EP Grand Overlord - Flawless Conqueror vMA/vBRP/vDSA no death/vHel Ra HM/vAA HM/vSO HM/vMoL HM/vHoF HM/vAS +2/vCR+3/vSS HMs/vKA HMs/vVH/vRG Oax HM/vDSR
You could be slotting northern storm for the extra magicka, unless you've already got that and are looking for a back bar ultimate. I would go with elemental rage for DPS, eye of the storm for tanking or pvp.