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Hi Stephen,
At that magnification with the sorts of objects you will be viewing, and with tracking, I expect that having a slightly larger field of view (Nagler) will be less important that comfortable eye relief. The Delos has 20mm eye relief compared with only 12mm for the Nagler. If you wear glasses the Delos will be far more comfortable to use in particular. I have a few Naglers with 12mm eye relief, and I don't mind it, but it is at the tighter end of the scale for that aspect of eyepiece use. If it were me, I would get the Delos.
I doubt you will get to use that level of magnification very often. People make all sorts of claims about how much magnification you can get for every extra inch of aperture, but at a certain point things seem to plateau out.
Phil Townsend from our forum has a 28 inch f/3.3. I doubts he would have an eyepiece anything as high powered as that in his kit!
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