I see all 4 RMEA has having some value. Kannagi is best when you're cRatio is pitifully low and the affects of adding +1.0 to your pDIF during Blade: Hi critical hits is most significant.
Also worth noting that Kannagi is by far the best white damage, which can come in handy at times (for instance, holding TP a lot due to not being part of the main COR-oriented SC in Divergence alliance?), and plays nice with all the strong crit gear we have (e.g., Kendatsuba+1). Buffs also don't have to be THAT bad for it to perform very well. I know everyone assumes perfect world of COR+GEO+BRD offensive buffs always, but this is certainly a YMMV thing. Kannagi really shines when you have a single (player) buffer in a party, or another practical example - pretty much any time you're doing anything with trust buffs.
I'm not gonna get deep into yet another Kannagi-war in this topic, but I'll say I think it's an underrated weapon - I can agree that it's not necessarily the first recommendation I'd give an up-and-coming NIN to go for though.
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Shun Heishi overcomes Kannagi as your cRatio rises as the attack bonus is essentially a cRatio multiplier. This is eventually overcome by Heishi Ten when your attack is high enough to allow the fTP on Ten scaling to trump Shun's attack bonus.
Agreed.
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Kikoku will compete mostly with Heishi.
With the major caveat that this very much depends on Kikoku having augments, and it falls well behind if not. So, kinda depends on whether the aspiring Ninja is also in a position to unlock 119 Relic weapon augments and willing to pay the significant cost to get the weapon to R15 (or at the very least, R10+ before it starts becoming competitive).
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Nagi is good if you want +40 enmity.
Eh... second place, maybe? If you're looking for best overall enmity/tanking mainhand, Fudo Masamune C and its variable Enmity+ and significant ninjutsu recast reduction (paired with Yonin's major boost to Utsusemi enmity generation) is pretty much always going to be the better overall enmity choice. Aside from enmity, you also get faster Utsu/Migawari from a purely survival-focused standpoint (pretty vital for blink tanking, no?). Oh, and Fudo also comes with significantly stronger offense.
I think Nagi is only really for free Reraise Mijin Gakure piece and a sweet looking lockstyle.
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In regards to the new katana, I think it might be best for many circumstances. The regain is being undervalued. Walking around and idling is a huge part of XI and a spreadsheet won't model this.
While you're not wrong that idle regain isn't modeled on a spreadsheet, you need to ask yourself whether you're using NIN in events with serious downtime between mobs. I think calling idling a "huge part" of XI is a bit of an exaggeration if you're talking about actual in-event time. Current battle content:
Divergence? Idle time between wave 1-2 mobs should be very minimal. Maybe wave 3 you get some slight delay moving between Volte clusters, but those seconds of idle regain for one somewhat stronger WS on the first of 8 mobs per set is surely not going to make up the difference between otherwise stronger RMEA.
Omen? Any idle time in Omen is only spent waiting to fight trash mobs that die in a flash regardless of using RMEA and no idle regain, or Ambuscade katana and idle regain. Meh.
Ambuscade? Maybe the best case for the regain, since you may get a decent chunk of TP while waiting on buffs. I'm skeptical that outweighs stronger RMEA, but it's a benefit. During the actual fight, you shouldn't have idle time.
Finished Gokotai (nin doesnt have rema on new char). I assume taka would be best offhand since we are basically spamming Hi with it?
You'd probably only want to spam Hi with a Gokotai if you were after easy 2-step self Darkness SCs. Aside from Light via Shun-Kamu (which uses Blade: Kamu, so... gross), that's your only solo katana 2-step Lv3 Skillchain that doesn't require Relic or Aeonic.
For Gokotai, if you aren't trying for Darkness, you're likely better off using Shun as your standard physical WS. Ku with the katana enhancement might also be worth a closer look, I'd be interested in how it compares to Shun in terms of straight up WS damage. Since neither one chains with itself, Shun-Ku (Distortion) is a reasonable self-SC option.
Hybrid WS like Chi can perform well IF you're getting strong magical buffs... but that's a very big "if" for many situations. I'd agree with Snapster that Aeonic TP Bonus may do more for hybrids, but the Ambuscade katana still should do pretty well.
But yeah, as for offhands to a Gokotai:
- Kanaria is a good all around choice, shoot for TA+3/Attribute augments (prob DEX>STR>AGI)and whatever DMG/Acc/Atk/Racc you can manage
- Ochu is also pretty solid all-around option
- Taka is good if you're focused on Hi, but otherwise falls behind
- Tauret might be an interesting offhand toy, but low native dagger skill means it's for content with lower acc requirements
- Fudo Masamune is a nice high acc/racc/ratk offhand option that should be BiS offhand situationally, though I would assume that most people with Ambuscade katana mainhand and no RMEA are probably less interested in paying for it. The Su4 version (Mochizuki) performs a similar role though, and would be a good acc-focused choice on a lower budget (plus, as noted above, could double as a nice tanking mainhand on path C with all of the same benefits of the Fudo Masamune).