Inaros only needs his 1 to open enemies up for finishers. Give him a dagger with "Covered Lethality", activate Zenurik and he is pretty much immortal as each finisher-kill heals him. Also you need to include buffs on Inaros at least as his 4 doubles his armor for spending health and as said he can heal himself up pretty easy.
Valkyr on the other hand is literally immortal during her 4 but limits her to pure melee. Outside of her 4 she may have still an impressive amount of armor (and modded it is around 85% damage reduction), but it is still tied to her comparibly tiny health pool.
And what is also important: Inaros is pure health and has over 7 times the health of Valkyr. This makes his armor stat (and the subsequent boost through his 4) more important than on Valkyr P despite her having 3.5times as much as armor has diminishing returns at some point.
With all put into account Inaros has 2200 base health and 400 armor (=57%), while Valkyr P has 300 base health and 700 armor (=70%).
P.S.: My favorite survivability Frame is Equinox (Night) with Maxed Range and the "Calm & Frenzy"-Mod...you don't need to tank if you can execute a sleeping army.
Tory Arashi wrote: Just run full tank with ice buff chroma,eternal war valkyr, and inaros all buffing each other and thier own armour with a saryn or a frost or a volt(for op attack speedz) or a rhino for the 4th
Also can any1 calculate how much armour valkyr and the rest would have from these buffs i bet its insane on chroma and valkitty
Only thing that I don't quite agree with is why you left out Quick-Thinking + Primed Flow.
Inaros will still have the highest Effective Health Pool.
On Valkyr Prime vs Valkyr: Valkyr with Quick Thinking and Primed Flow is a total 412 energy multiplied by 2.4 = 988.8 Energy Health which is also protected by Steel Fiber & Armored Agility (1530 armor) = about 1,819 additional Effective Energy Health on Valkyr.
Valkyr Prime with Larger Energy Pool gets 618 energy multiplied by QT's 2.4 for 1,483.2 Energy Health. Protected by 1785 Armor it is an additional 2,743-2,758 Effective energy health pool (Dependant on game rounding)
Inaros with Primed Flow and Quick thinking gains same 988.8 Energy health. 510 Armor boosts the additional Effective HP to 1,628.
Quick Thinking + Primed Flow provides a larger Effective Health stat then Vigor, Redirection, and on Valkyr Prime even Vitaltity.
When looking at base abilities or even just no abilities but utilizing Life-Strike or healing Returns: Inaros and Valkyr can utilize Rage to keep the cycle between Normal Health and Energy health.
Inaros can take a larger 1-shot damage spike than Valkyr or Valkyr Prime with no abilities active.