So having used both strats:
The different between Versatility and Haste seems very minimal.
Testing vs the Spellblade Script: Versatility comes up top for pure Survivability.
However using the Blender on it (at the Balanced Setting), I can trade out ~0.5% Death Chance for ~15% DPS - which I think is well worth it - with Haste now equal to Versatility, maybe a bit higher.
Based on that, I think you want to keep them close together - leaning towards Versatility if you need a bit more Survivability, or Haste for DPS.
But frankly, it's just easier to plug it into AMR's Best in Bags, and get it to recommend your gear for you