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+

WARMUP for Torment 13 Barbarian Speedfarming Competition in Diablo 3

What a juicy rift, and i had just 18% cold here instead of 40% (found cold bracers later) . https://us.battle.net/forums/en/d3/topic/20759260985?page=1
Participating in the competition!
Rules: no DBs, just legendaries. I also picked up all the loot from RG, so lost at least 5 seconds each time.
Here is the build that i used: https://www.youtube.com/watch?v=ljBmuGMLpVA
http://www.diablofans.com/builds/79501-whirlwind-t13-speed-king
https://www.angryroleplayer.com/diablo-3-builds/barbarian-builds/whirlwind-t13-speed-king/