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I believe the XW will be the better EP, but the Radian is a very nice EP also. I have used the 5mm Radian and 7 and 10mm XW but never XW and Radian of the same FL. I tried to compare barlowed XW-10 to Radian 5mm but I could not pick a winner as seeing was not good enough. One thing I can say for sure is that Radian has more of a yellowish tint than the XW. This is a slight advantage on some targets, disadvantage on others.
The Radian is a very different EP from the Plossl, so your impressions of the 20mm plossl won't be any indication on the performance of the Radian.
The XW-10 in a good 2x barlow (Televue, or maybe the Orion Deluxe 1.25") is a good option costing a lot less than either EP.
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