Fury is a must buy tbh even at 20m, its basically auto cancels OG Fury after 2 hits and gives a chance at 100% crit chance if it crits.
Flurry makes dw switching for AoE dps much more rewarding as it reduces the zerk cooldown and does more AoE damage. Will definitely be buying it in the near future for slayer.
Barge seems to most niche out of these and the price point doesnt help it at all. There are few instances where your channeled abilities get cancelled alot and where you'd incorporate mutated barge to help solve that problem versus just going on with your current rotation.