Each ROM doesn't really serve a different purpose for me, it's really the flavor that I'm feeling. My 3 ROMs consist of 2 TWs (digi and Mack) and 1 CM based (PAC).
If I had a Galay Nexus, I'd probably still have 3 ROMs. Stock Andy, PAC and CM. I'd be trying to figure out how to load TW type features on my stock Andy, like Multiwindow.
You can have Stock Andy on your GN2 if you want that is essentially what CM is just better. Yes you may or may not have LTE, but that's a problem the Nexus has anyway.