longtime Cubase User as well here:-)
I used Cubase since the old Atari days. Stucked to it till Cubase4, but I was very dissapointed with Cubase5. So I switched to Presonus Studio One, because it has an awesome drum editing algo. Back then I had Cubase4 and a small ProTools rig, that I only used for drum editing. So I recorded drums in Cubase, exported the Waves Files into ProTools. Edited the drums, bounced the files and drop them back into Cubase. Than Studio One came up with the "audiobend" feature, what is way faster than beat detective in my eyes and I made the switch. Sadly Studio One is not that stable in comparison to Cubase or Reaper...so I'm thinking about to switch back to Cubase7, which has some awesome new features.
Sadly if you go with Nuendo Live, you will need Cubase7, if you like to directly open the Nuendo Live project in Cubase. By now, I drag the recorded waves files on a USB drive and drop them into Studio One. This is quite fast too.
Nuendo Live has some really nice features, like "one click recording".
When you are late on the job, just connect your soundcard (or X32) to Nuendo Live, start the programm and hit the "*" Key. Nuendo Live will automatically record all recognized inputs! In addition Nuendo Live is made for long time recordings..basically you can record 24/7 as long you got harddrive space left. Nuendo can even restore corrucpt recordings (f.e. during a power fail), it has just one windows, no submenues (very easy to operate), an ASIO guard and lot's of more cool features.
The downside is, it has just very basic editing tools and you can't load any VST plugins. This is just for recording and virtual soundcheck. You will need a second DAW software, if you like to mix your recordings.
To sum it up: Reaper is cool for both recording and mixing. Nuendo Live is the most professional choice by now, if you just want to do live-recordings.