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I don't think it has any difference to do with the inherent contrast of either eyepiece. Some people just prefer the framing of a jet black field stop and in some ways it creates a contrasting border and the field stop directs the eye in toward the centre of the field where the `action' is . With the 100 degree field the eye wants to swing around randonly trying to get its `bearings' .
I had a similar experience daytime viewing through WO 66mm refractor. I much preferred the 18mm Radian's 60 degree field to the 13mm Naglers 82 degree. I just enjoyed the framing of the view . That might not have been the case for night time viewing .
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