Bubble the target being CC-chained rather than the one taking damage - Fear/stuns are the bigger threat than raw burst here.
DoTs slowly whittle down two melee - Cleanse when possible and try to close the fight before Corruption/Curse of Agony stack fully.
Long grind favors whoever has better mana efficiency - Purge/interrupt the Druid's bigger heals when you can.
Both sides bubble and grind - whoever lands Windfury procs at the right time during the enemy's cooldown gaps usually edges it out.