FWIW I don't consider Marines the optimal target for Scorps. I think they're better suited through chewing piles of guardsmen and so on. Against 10 guardsmen, 1.67 mortal wounds doesn't match up imo to an additional 10 attacks, which should pan out to 3 wounds after saves.
That being said, Scorps don't feel great right now with the mortal wounds. Not sure what the solution there is.
Banshee's are great for guardsman, but not much else, so scorpions are kind of the default option for general lists and the Mortal Wounds allows them to hit harder stuff and still go to town on guardsmen, so bit of a balancing act.
10 Banshees (1 is Exarch with P Sword) costs the same as 8 Scorps (1 is Exarch with Biting Blade)
Vs MEQ:
Banshees: 21 attacks, 14 hits, 4.67 wounds, 3.89 wounds post-save
Scorps: 14+3 attacks, 9.33+2 hits, 4.67+1.33 wounds, 1.56+0.67 = 2.22 wounds post-save, + 1.3 mortal wounds -> 3.52 wounds
Huh, interestingly, Scorps led by a Biting Blade Exarch pretty much match Banshees against MEQs, when you factor in the mandiblaster mortal wounds.
10 Banshees (1 is Exarch with M Swords) costs the same as 8 Scorps (1 is Exarch with Chainsabres)
vs GEQ:
Banshees: 18+3 attacks, 12+2.67 hits, 6+1.33 wounds, 7.33 wounds post-save
Scorps: 18 attacks, 12 hits, 8 wounds, 5.33 wounds post-save, +1.3 mortal wounds -> 6.63 wounds
Also interestingly, it seems like Banshees outperform Scorps... against everything? Am I doing my math wrong here, or giving people the wrong equipment? I guess the mortal wounds don't really mean too much against Guardsmen, which is why Banshees clean up, and the pswords are more important than the mortal wounds against Marines? I must be making some kind of mistake here, or arming hte exarchs wrong. Please advise.