I don't like the weight factor of either one. For me that's the biggest issue. I weigh (haha) getting these or just sticking with my 32mm plossl (which is a televue )
I think if my scopes were really big I'd probably own one of the two. But personally I struggle with the idea of such heavy eyepieces.
Back when I only had my 10 inch dob I had the 26mm Nagler which I felt was a better choice for my situation. But with my 4 inch refractor I think I'd like the 31mm or 30mm.
The more I think about the more I rather just stay with smaller lighter eyepieces and deal with a bit less FOV.
BTW I have compared the 31mm Nagler to the 30mm Meade UWA (should be similar to the 30mm ES). I thought both eyepieces had their pluses and minuses and were very close. I seem to have prefered the 31mm nagler and had no bias at that point because both of them were not mine. I also didn't really have much thoughts toward brands at that time. Bottom line in that situation if you would have told me one was half price (and it wasn't back then) then I would have said OK. Back then the two prices were actually pretty close. I probably would have gone for the televue back then. Now it's much more of a gap in price.
Totally agree about the weight factor!