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This is so completely firearm specific. If running on a VZ58, the Vortex Razor is the way to go due to the suitable mounting options. On something like an AR or Tavor, I would certainly want the ACOG.
Acog on a 7.62x39 VZ58 18in bbl, because it's perfect for the effective range. Rear mounted on a dust cover mounting system or side mount. For a shorter barrel, the red dot on a forward mount.