Assassin/Ninja Help What Build Should I Use?

I've been a bit torn on this decision, any feedback is appreciated!
https://wynnbuilder.github.io/#4_0Ba07N0kT0VN0Jf0BK0BI0Ji0Gc0013002G1Q1g00000
WynnBuilder build:
> Kindled Orchid
> Calidade Mail
> Second Wind
> Nether's Scar
> Breezehands
> Flashfire Knuckle
> Flashfire Gauntlet
> Contrast
> Flameshot Hilt []
I used this build but with bygones to solo li and had to use a whole inventory of hp pots. Flameshot has slightly better sustain and more ehp with less damage, but the sustain pales in comparison to these other builds.
https://wynnbuilder.github.io/#4_09S0lr0D40Jv0Jf0BK0BI0Ji0Pt1A1E00151a1g00001006C6
WynnBuilder build:
> Centipede
> Smack Jacket
> Dark Shroud
> Humbark Moccasins
> Breezehands
> Flashfire Knuckle
> Flashfire Gauntlet
> Contrast
> Limbo [e6f6f6]
I used this as well to do li, it has much better lifesteal and better damage than the above and also double the walk speed, which was really helpful. However, this has the lowest ehp out of all of them as well as the lowest ehp without agi. I really struggled to stay alive with this build
https://wynnbuilder.github.io/#4_0VI0C70kT0VN0Jf0BK0BI0OO078001a001W131g00001000CO
WynnBuilder build:
> Nephilim
> Gaping Cavity
> Second Wind
> Nether's Scar
> Breezehands
> Flashfire Knuckle
> Flashfire Gauntlet
> Diamond Static Necklace
> Bygones [f6f6]
I am leaning towards this one the most. The ehp might not look different from the limbo build, but it has around 80% more ehp without agility, as well as more sustain. My only regret is that it doesn’t have nearly as much ehp as the flameshot build, and it also has less hp, making it more vulnerable to true damage.

 

I always factor in possible buffs as well if I wish to bring it to raids or higher content. Potions are cheap.

I lean towards the third build, because sustain is really nice to have, as you can stand still more and keep DPSing. That build also scales better with potion/raid buffs, because obviously this build would pick Stonewalker in TCC, closing the gap with the Flameshot Hilt build that cannot take advantage of more defence points, because it already has it near max.

Third build can also use Courage, which can be a nice buff. Stacking enough % won't be fast, but it's possible.

Just my opinion! :)