I can only compare paper white 2 vs voyage
The voyage screen has higher res and a little better contrast, but the top is noticeably a different shade of color than the bottom. Many people swear by the haptic buttons, but they are useless to me. (I liked the kindle keyboard buttons best.) The flush screen is not a big deal to me. For the $120 refurb price, it's worth it to me for the lighter weight and better contrast / resolution.
As for the spacing, I read with largish fonts so they are a problem. I actually use the old mobi format to avoid having large gaps between words in justified text. (I don't like hyphenation, which are not always available anyway.)
As others have said, it's best to try it yourself.
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