A general comment, if I may. The concerns about update cycles of software are a constant issue to many people. It’s as though their current software becomes useless as soon as another update or upgrade is available. Human Nature
That concern would be the only reason not to use Nuendo instead of Cubase if you’re doing composition and video or film post. 95% of what I do is music production, most often, without accompanying video. I use Nuendo because it has all the compositional content of Cubase, plus features that may be specialized for post but I find very useful often in music production as well.
I happily ignore all the noise and chatter about “Why didn’t I get this first” and " I paid twice as much as Cubase so this should be perfect and I should get every single feature before they do!"
Everything in Cubase/Nuendo would have been Magic From The Future not so long ago. Is waiting an extra three months for Widget X going to ruin my life? I think not. Plus everyone conveniently forgets when we get features first, never mind the features that only we get.
All comes down to priorities and being thankful for what you have. Works for me. I recommend Nuendo if you have the $$$. The difference in price between the two, as a percentage of your total set-up cost, is next to nothing. What is your time worth?