When you think about the price, don’t forget that in the future - after the included N10 update - you’ll then have higher update prices for Nuendo than for Cubase, for every version for eternity…
Here’s a list of additional features in Nuendo (a few of these things are now in C10, like AAF and video-follows-edit mode):
Loudness Track could be interesting, but it’s a struggle to find additional useful things for just music.
Nuendo is aimed for professional audiovisual projects, film/post, games, adr…