Having owned a number of both types of EPs, IMO the difference between XW and Stratus is not marginal at all but very obvious from the first moment you try to focus with the eyepiece in the focuser. The Stratus (and Hyperion) are the best in their price range. Stratus, Hyperion, LVW, XW: these are all worth the investment if you can afford them. XW-14 with a typical Newt does have field curvature though and I do find it bothersome (this varies from one individual to next).
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