Interesting topic...I really enjoy her CDs much more than most of her live songs...sometimes it seems that she doesn't properly prepare for them. (Although she has improved a lot recently, in my opinion.) However, some songs I absolutely LOVE listening to Live, such as HANABI as sung in a-nation 2005...that was beautiful.
But OVERALL, I like her CD performed ones. In the lives, though, her emotion seems to really come through, which is something I like.