let mi show u sum magik! ***

a wild hashirama appears!
All jokes aside, I did some testing on my own and found out various stuff. I will be comparing mystery (buffed and non-buffed) and standards (buffed and non-buffed) on a team of Kakashi. The reason I tested on a team of Kakashi was to show you the damage range which may not entirely be accurate but gives us a gauge of how high and low Sage Naruto can deal with his mystery.
With Hashirama's barrier

With 30% passive increase and 40% barrier increase.
Without Hashirama's barrier

With 30% passive increase only.
With Asuma's Buff

With Asuma's 30% all damage buff on full health.
Without Asuma's Buff

Look at all those Kakashi's having stomachache.
What I can say here is that with Asuma's buff, Sage Naruto wins Hashirama by about 200~300 damage (800~1200 damage on a full ninja team) without Hashirama casting Barrier. However, with Hashirama casting his barrier, he wins Asuma by 600~ damage (2400~ damage on a full ninja team).
One downside to Hashirama though is that his mystery only damage 2 ninja for two turn IF he successfully cast his barrier as compared to Asuma WB's mystery which damage 4 ninjas for a tons of damage in a single turn. Therefore, I agree with you on the point that Asuma WB's is good in quick fights.
For Asuma WB to work well, you need to have Iruka, which means that you are sacrificing a slot for his mystery which is an interrupt (hey! Hashirama inflict interrupt on his chase too! You just gotta move first before your opponent :P) and doesn't inflict knockdown etc. However, even with Iruka and Asuma Windblade, you run the risk of potentially losing the buff on turn 1 or 2 if opponent has better refine than you or they are running ignite/poison *ahem* karin, water main, tobi ... Unless you can gain 20 chakra more in turn two, you aren't going to cast Asuma WB's mystery until turn 3, by which you will most likely not be full health. If you're still full health.... STAHP BULLYING NEWBIES.
It is important to not forget that Hashirama's barrier increase taijutsu damage too, which increases Sage Naruto's standard (which already deals lots of damage).
Standard with Hashira's Barrier

Standard with Asuma WB's passive

Standard without Hashirma's Barrier

With Hashirama's passive of 30% increase ninjutsu.
Standard without Asuma WB's Standard (C*so be Standard without Hashira's barrier and passive)

This gives you a comparison of the standard that Sage Naruto deals with the various buffs and without buffs. In my opinion, Hashirama provide more utility thanks to his immobile. I would recommend Hashirama over Asuma WB's if most of your rounds with your opponent last more than 3 turn. After 2~3 turn, Asuma turn into a ninja with 3 turn mystery and a chase that inflict blindness. Ultimately, it depends on the lineup you are running.
And of course, I didn't forget about Iruka's passive which increase ninjutsu. This post is mainly to talk about the comparison of Asuma WB and Hashirama
This post was last edited by Narbsy at 2016-10-1 23:03 This post was last edited by Narbsy at 2016-10-1 23:04 This post was last edited by Narbsy at 2016-10-1 23:05