Whirlwind Barbarian: ISTVAN’s vs. BUL-KATHOS’s.. which is better? Diablo 3 (2.6.1)

I had this video done during the PTR but totally forgot about it.
Bul-Kathos swords were buffed, so…. might be a potential return into WW meta build or Istvan’s still good enough? Let’s go into details here and uncover the truth!

Both builds here:

Bul-Kathos’s WHIRLWIND V2.0 GR100+

Istvan’s WHIRLWIND GR100+

Istvan’s WHIRLWIND GR100+ Barbarian WW Build for Diablo 3 (2.6.1)

Istvan’s WHIRLWIND GR100+