Ranger and more shots, when it comes to hordes with 5/6+ saves, the extra shot and range is better. 9 of them is 36 shots at 36" vs 27 shots at 24".
Scat: T3/5+ = 13.33 dead
Shur: T3/5+ = 11 dead
So the math says its better and you also gain more range.
Dont forget you can Fire and Fade to move and always be out of range of 36" shooting, move shoot move is very strong on Fly long range shooting units and with Saim-Hann trait you dont take -1 to hit for moving.
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