While the impact on detection may be debatable, the hard facts that I've found so far is that they are the same aside from the OBS scope can look straight up.
They seem to have the same FOV, turn at the same rate (I have to move my mouse the same distance to do a full 360 degree rotation) I don't see any difference in "image contrast or quality" at night.
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T. E. Thompson, LTCDR
Commanding Officer, U.S.S. Seal (formerly S-40 (SS-145))
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