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I'd say points cost limits their effectiveness. Ravagers are cheap thus more common.

The Razorwing's dual role is actually a Con in many case. If your anti-tank and your anti-infantry are the same unit, they can only do 1 thing at a time, meaning there's a turn where you have Dark Lances shooting infantry.

The missiles on the Razorwing are fantastic, but as Exergy said, DE need more anti-tank, not more anti-infantry

Personally, i run 2 Razorwings for that really hard hitting 1st turn/alpha strike against anything that isn't mech-ed up.

As for the voidraven, it's pts cost again. the S9 lances will glance or better 4/9ths of the time vs the ravagers 2 S8 lances glancing or better 3/9ths of the time. The ravager gets 3 shots so you're glancing or better on average vs the void ravens 2 shots glancing or better 8/9ths of the time on average.

So it's pretty much a wash in terms of effectiveness but the large jump in pts for not being open-topped and being supersonic make it the 4th heavy choice (behind ravagers, razorwings and taloi (out of webway portals))