Depends on how much cold damage increase you have, and if you're struggling against cold immunes or not. %damage is usually better for cold sorc.
Do you have a 15.5k damage blizzard?
1600 orb dmg and 10k blizz
I went max orb, max blizz, rest into glacial spike toward blizz synergy. I do only pvm on Xbox, I don’t have tons of time for the game anymore.