This is a good ** ROUGH ** List .. I like it,, Some Dont, there are others ...

Hellhades,, Ash, and a few more ,, But this one is Fast , easy , and fairly good 

https://ayumilove.net/raid-shadow-legends-list-of-champions-by-ranking/

Just ignore the "recommended artifacts" in the game completly.

And don't put supporters with low damage (like Apothecary) in a lifesteal set. Maybe fighting the Clanboss is an exeption from that, here everybody could use a lifesteal set. But in 99% of the content guys that deal very low damage dont get big advantage from lifesteal.

As a rule of thumb: 

Everyone needs speed. Being killed by your enemy before you can act is not good.

Champs that are supposed to deal damage need their damage attribute, crit rate and crit damage. Savage is also a very good (and very underrated) set. 

Supportes need even more speed, because they should use their support skills as often as possible. Specialized sets like Reflex could be used as well.

Debuffers need Accuracy to land their debuffs. 

You should manage the speed of your team to have them act in the right order. Giving an atk buff to your damagedealer and/or landing a def debuff on the oponnent after your damage dealer allready attacked is obviously not optimal.

/edit:

Renegade is a very usefull champion. My Renegade is wearing a frenzy set. The description of this set is wrong. It says, the turnmeter filling does not occur from selfdamage, but that is not true (somebody tested with a Taurus, who immediately gets an extra round when using his A3 in a frenzy set).

The skilldescription from Renegade's A3 is wrong as well. It says "this skill does not affect this Champion", but it should say "this skill does not affect it's own cooldown". Renegade can affect herself (her A2) with her A3 if you used the A2 before.