Burst comps can overwhelm two healers if the opener lands clean - bubble/Nature's Swiftness the instant the Rogue's stun chain starts, don't wait for damage to land.
Dispel Fear immediately and keep both healers topping the Warrior - your sustain wins a long fight if you survive the opener.
Both sides can grind forever - whoever survives the first real CC chain on their Warrior usually wins the war of attrition.
Mirror-ish matchup - your second healer gives you the edge in an extended trade, so avoid overcommitting cooldowns early.