Depends on what you're feeling at the time. The words work whenever you're feeling somewhat rebellious, while this works if you want to feel the peace of the atmosphere. But I also combine the 2 versions every so often. :P
Just search for "FFXIII-2 OST Plus - Unseen Intruder Instrumental" on youtube. Others have uploaded it without extension. The song is like 6 minutes long.
Seriously. Those vocals, that "rapping"... it's completely wack. I'm glad they realized that for the NA localization. If only the OST PLUS had the instrumental version of this song so I could replace the OST version with this version in high quality.
I don't have the software to do such awesome things! I can mix two songs, but I can't remix them completely. That's crazy talk! But it must be so easy for you geniuses, huh? o.O