New Warlord's Bloodlust vs Fervor

With the changes to Warlord's Bloodlust coming in patch 6.4, do you guys think it'll be worth running Bloodlust over Fervor?

New Warlord's Bloodlust: Attacks on champions gain increasingly more Lifesteal based on your missing health (up to 20%). Half effect vs minions.

Current Fervor of Battle: You gain stacks of Fervor for 6 seconds whenever you damage an enemy champion, stacking up to 8 stacks, based on the type:

1 stack for ranged basic attacks.

2 stacks for melee basic attacks.

2 stacks for ability damage (2 second cooldown).

Each stack of Fervor adds 1 - 14 (based on level) bonus physical damage on basic attacks against champions for a maximum damage of 8 - 112 (based on level).