and you doing blizz/es or full blizz ?
Es if your res is low and leveling through NM etc. Then switch to vita. Or straight vita all the way. Depends what gear you have.
Vita is always going to be better for cold sorc. Cos of mana burn and because your stuck using insight on merc. A merc with might aura Reaper’s, Gface, and Treachery/Fort will beat any insight merc. No need to hybrid build when you have a merc like that you can go straight cold/static.
Nova es block sorc can equal it though but requires some serious hard to find or expensive gear to get that kind of es build.
The other build that is good is a fireball/blizz sorc. But that requires your sorc to be mid to high level 90s for the fire and the cold to do decent damage. And requires a full inventory of skillers.
Orb/hydra can work ok too but if you have played the other builds you will know it's not as effective. But it is easier to play because you don't have to tele bounce around as much.