Best Izuna core: Normal, Nagi, or Kon?

Hadn't been playing my Izuna since I return the game. So I thinking of moving part from one of my seraph to an Izuna instead of leaving them all to collect dust.
I have all 3 core but only used Nagi before so I not sure which is the best
Is EIW worth it on any of them?

The equipment I have for Izuna to use are
-Standard Air: Plasma gun G.rapid + H.rapid + para, Telsa AM5, curve lightning gun, Spread beam cannon, Beam launcher
-Anti-Air: Mini zook 2 G.rapid + para
-Melee: Adone LG, Crimedge, Jump halberd

Probably only going to tune if I have spare mat since this is more for fun than a serious build
Think of going standard Air but melee can be fun sometime

I love AIR melee, but you're gonna need some really heavy tuning. Your best bet would be the Adone LG/Crim Edge, but you probably don't have room for both with said heavy tuning.

Cartwise, Izuna has Stun Regain/Stealth System, Nagi has Moving Burst/Stealth System, and Kon has Moving Burst/Broad Radar. There are ups-and-downs to each, basically.

I don't recall if there's a difference between Normal and Nagi for Vanish Jump, but it has a bit of a stall for either action, and its aerial move is a drop. Kon has relatively no stall in its activation, and the aerial move is a horizontal dash. Kon is essentially the better core in terms of the sub, as a STOVL BS can give you a drop without the stall of the earlier BDs. None of these work into melee.

EIW becomes a necessity if you rely on any of their jumps, as it doubles their respective ammos. However, that is an expensive build direction to go, but if you make good use of it, then it works out.

Their stats are 7/12/9/16/5, 9/8/8/16/8, and 7/12/8/15/7. So, Normal has the most TEC/FLY focused, Kon has roughly the same but with a bit more TGH, and Kamui gives you a more balanced array with great FLY.

In most cases, I'd say Kon is more useful, because her core Sub is far more versatile and she gets Broad Radar. But if you don't rely on her Sub or on Broad Radar, and instead just go for her M-size and decent stats (particularly that FLY), any of the cores can really do the trick.

I don't think there's really anything to add. Jade hit it dead on.

its also worthwhile to mention that kon is kind of the newer generation izuna that keeps her basic core feature and makes it much more versatile
if i had the three of them available i would build up a kon before the other two (except id really need one of the normal core weapons features or cartridges)