I'm not sure on the exact calculations, but unless you build a bomber, it's almost always better to increase crit damage, provided your crit rate is at 100%. 

I do believe it scales off the damage you were going to deal, meaning after the damage calculation took place (your damage dealing stats * multiplier) but before defense was taken into account. 

There  is  a  discussion of  this  on  HH.  There  are  several  assumptions that  go  into  it,  e.g.  100%  crate,  all  else  being  equal  etc.  

The  best  bang  for  the  buck  is  when  

tota  attack  /  base  attack  =  (100%  +  cdmg%)  /   100% 

This  can  be  transformed into  an efficiency  index (EI) where

EI  =  [total  attack  /  base  attack]  /  [(100%  +  cdmg%)  /   100%]

example,  champ  has  1500  base  attack,  3000 total,  and  100%  cdmg

EI  =  (3000/1500)  /  [(100%+100%)/100%]

EI  =  2  /  2  =  1

If  EI  >  1,  then  increase  in  cdmg  would  help  more  than  increase  in  total  attack

If  EI  <  then  increase  in  total  attack  would  help  more  than  an  increase in  cdmg

please  note  that  an  increase  in  either  would  always  help,  EI  just  tells  you  which  would  help  more

In  the  above  example  EI  =  1,  which  is  most  efficient ratio,  but  an  increase in  either  would be an improvement.

This  holds  true  for  hp/def  champs,  but  not  when  dmg  is  based  on  a  combo  of  stats  or  enemy  max  hp.

@Angwil  

"

If  EI  >  1,  then  increase  in  crate  would  help  more  than  increase  in  total  attack

If  EI  <  then  increase  in  total  attack  would  help  more  than  an  increase in  crate "

Increae crate instead of cdamage?  

Lol  sorry  my  bad,  old  fart  gets  confused.    Ill  go  back  and  edit.

If you have a critrate of 100%, every hit will be a critical hit. If your crit dmg% is zero, it will just be a regular hit, but coloured yellow. If you have a 50% crit dmg, then the critical hit will be 50% stronger than a regular hit (but if you have 100% crate, there are no regular hits left, only crits or potentially weaks). Hence, if you built a total atk double compared to your base atk, that's equivalent to critdmg 100%. So build them in same ratio.

(except proc'ed hits where the skills explicitely says it can't crit - pay attention if your build evolves around this by any chance, then the base skill will be more influential).

HOWEVER, buffs behave differently to this:

- 50% ATK buff is a 50% increase to total dmg, nomatter the kind of hit (only for ATK based champs, duh)

- 30% CritDMG buff is a 30% increase of total dmg (not just an increase of the multiplier), IF is a crit hit (mind the above nuance, also regarding weak hits)

From this, just visiting the very basic notions, keeping in touch with the affinity weakness will potentially be one of your biggest dmg increases possible.

Finally, worth exploring weakness and def down/ignore def% (both increase total dmg and are complementary to each other), them might be easier to come by than this spectacular piece of gear giving exactly this and that substat.

Have been going off of: https://hellhades.com/how-your-damage-is-actually-calculated-in-raid-shadow-legends/

But mostly using: https://hellhades.com/damage-efficiency-tool/ to figure out what kinds of thresholds I can hit. 

OMG, this is so much more complicated than my simple brain can decypher!  So Crit DMG is based of total Damage?  Example: (3000/1500) / (100%+200%)/100%=2/3-> damage is maxed based on artifacts+base+whatever, I would need to LOWER my crit dmg?  Or just saying that an increase in damage would benefit more than C. DMG? I just wanted to know who my best AOE nuker would be, and build a team around him/her.  I feel like a 5 year old trying have a conversation about physics with a bunch of physicists

Nope, my understanding is WAY off, according to HellHades

Never  ever  lower  either  just  to  get  the  index.    

1000/1000=2000/2000=5000/5000=1

the  index  just  tells  you  which  would  be  better  to  increase.

hh  also  has  damage  rankings  for  all  champs  and  there  are  a  few  videos out  there  ranking  the  top  damage  dealers.