12 spell dmg or 5 crit 6 spell dmg for pvp suit (arena)??

[BobGnarly]

"hoping for a lucky crit."

You're not really hoping for a lucky crit to increase your damage - you are hoping for a lucky crit to surprise and outdamage the opposing team's healers.

You say it yourself, you're "hoping." I prefer to win games by forcing my opponent to lose, not hoping I get a lucky string of crits.