I've been working full time as a sound engineer for music and TV buisness since 2000. In the few last years, I was mainly using Protools 7/8HD and Nuendo 3/4.
When you are working as a professionnal, the system/software need to be a extension of your thoughts...it need to be fast, flexible and without limitations.
I my opinion Protools 9HD is the way to go...mainly because of is way to work with automations, it's ease with editing, it's hardware I/O (less user frendly but so flexible) and it's low latency. Also, when you have to do a very long session (over 1 hour), it is very easy to do a quick fix in Protools without having to redo the entire bounce.
I've tryed very hard to edit and to use automations in Nuendo (for plugins, pan, volume, etc.) without acheiving the 1/3 of what I am able to do in Protools. I got pretty fustrated by all those limitations so I am now only using Protools 9HD.
Conclusion: Neundo vs Protools LE= Nuendo Nuendo vs Protools HD= Protools
*Sorry for my bad english.