If I may add my two cents here:
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Nuendo lets you display audio waveforms without all the junk obscuring them in Cubase, like gradient overlays, cursor highlights and the like. This by itself is a reason to make the switch, at least for me. I find it unbearable in Cubase, and this is certainly no coincidence.
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Nuendo features a red outline to indicate selected parts. Less eye candy, better usability.
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Nuendo has a mono/stereo toggle switch in VST plugin windows
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Nuendo features one additional Mixer ( 4 in total ) , which I find very useful
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better DOP
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better X-fades
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Randomiser, which is pretty useful in musical contexts as well
and loads more, with the above just being what matters to me personally.