I think I prefer the diopter on the NL because I never like pulling the cap up on the diopter like on the EL. I agree that RB is less than expected and precise eye placement is necessary with the NL and the eye cups have to be just right and the focuser isn't quite as smooth as the Zeiss. Your right about the NL having great natural colors and there is glare at the bottom of the image in a lot of situations but it is tolerable but I think besides the wide FOV the transparency is another big advantage the NL has over other binos. I think the armor is fine and the integrated objective caps work well and I don't have a problem with the FP strap attachments but I did use the adaptors and installed my own Vero Vellini strap instead of the Swaro strap.
The diopter of the NL is fine, especially if you leave it at 0, as I think you do, but if you need to use it then it's less precise than the diopter of the SV/FP as its scale is less detailed. I agree with you about the "transparency" of the view thru the NL, I am not really sure how to define that precisely, but I think it's a combination of the NL being bright and sharp, as well as having a good color balance and very little CA.