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I bought Geoff's 26mm Nagler in preference to a 30mm XW, purely for reasons of exit pupil. It produces a 5.6mm exit pupil in my F/4.6 scope, whereas the 30mm produces 6.5mm. The eye relief doesn't bother me provided I fold the rubber eyecup down.
That said, the XW 30 is a great eyepiece for all the reasons mentioned below, esp contrast & comfort. They are both great choices.
Note that they are both heavy eyepieces so can cause balance problems (around 0.7kg). But the 31mm Nagler is much heavier again at 1kg.
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