Rug wrote:
Due to it's relatively slow speed other eldar direct fire tanks have a greater striking distance
25cm + 60cm is longer than 35+40 on a normal move or hit-and-run double, and it's equal on a straight-line double. The Falcons arguably have an advantage for positioning for pop-ups or moving to get LoS around cover, but on the whole it balances out in terms of viable target selection.
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the 2008 updated skimmer rules also make it much harder for the Scorpion to get LoS on a target.
Also applicable to the Falcons you compare it to.
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Two Macro shots are not all that useful, heavy tanks with reinforced armour will still get a save, and there just isn't the volume of fire to shoot at lighter armoured targets.
That's not the preferred target for Scorpions, so there is a certain amount of cherry-picking in this comparison. The best thing for Scorpions to attack is high-value, non-RA units. As far as volume, they should select targets so they get 2x as many kills per hit as normal fire. It's also flexible in target selection and can hit high value infantry if desired. Scorpions are murder against forces like Space Marines and CSM.
2+ shots are extremely useful if you are playing a hit and run style. The -1 for double move only drops their effectiveness by 20%. On a double move, a Scorpion will actually do more damage to 4+RA as Falcons (4 Falcons/1 Firestorm) because the to-hit mods affect the Falcons so much more strongly. That's also true for other AT-focused formations in the same point range, like Pred Annihilators.
Because of the superior quality of the hits, the volume differential is offset. Only when Falcons are close enough for secondary weapons do they really get an appreciably larger number of kills (more hits, sure, but not more kills).
Despite all that, I would probably agree those firepower comparisons still favor Falcons. However, this is all "out of the gate" comparisons of untouched formations. Once the formations come under fire, the comparisons shift towards the Scorpions. Falcons can be suppressed. Scorpions cannot. One AT hit can only stop a Scorpion on a critical (~7% chance). Against the Falcons that single AT hit suppresses at least 20% of the formation for the BM, and on a failed save (67% of the time) the Falcons lose 60% of their firepower.