Rune of Expose Weakness vs Riverglades Marsh Gas

Rune of Expose Weakness
Binds when picked up
Classes: Hunter
Use: Engrave your belt with the Expose Weakness rune: Your melee and ranged criticals increase your attack power by 40% of your current Agility for 7 sec.
Use: Learning
"Teaches you a new Engraving ability."
Item Level 40

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Riverglades Marsh Gas
Binds when picked up
Use: Reduces movement speed by 50% and increases Fire damage taken by all targets in a 5 yard radius by 15 for 15 sec.
Sells for 2 Silver 4 Copper to vendors
Item Level 38
FOREVER New in World of Warcraft Forever: not in Classic Era.

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Side by side:

Set your class weights in Preferences to see which is better for you.

Stat Rune of Expose Weakness Riverglades Marsh Gas Δ
Item Level 40 38 −2
Sell Price 2s 4c +2s 4c
Binding Binds when picked up Binds when picked up

Δ is Riverglades Marsh Gas minus Rune of Expose Weakness: green where Riverglades Marsh Gas is better, red where it is worse (a lower required level is better; speed and sell price have no better side). Total Stats adds up Str, Agi, Sta, Int and Spi.

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