I doubt there is any reason to chose between Libra or Paperwhite based on screen. Yes, the PW4 isn't quite as good as PW3 and the Original Libra is very good.
Unless your main thing is graphic novels then any difference on image rendering is irrelevant as it's marginally different.
But really the difference between any eink 300 dpi screen today is marginal. The support of collections, series, covers, annotation, ease of finding a book etc more important. The Amazon store doesn't enter into it if the existing PW is never deregistered as the OP already has a Kindle and Calibre.
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