If you've looked at my profile, you'll see that it's at the top of my favorite anime list as well. LE has been my favorite for... well, since forever. The only other one I've seen on the list is Shangri-La and I plan to watch Planetes eventually. Hasn't stopped me from hearing all of Kuroishi's music, though.
I'd have to say Code Geass as it's the only one I've seen and been able to complete. Shangri-La was way too boring and confusing for me, I'm sure I'll take it back up one day though and sorry if I offend any Shangri-La fans, it's just my opinion.