I could never choose a favourite album. I love all five including BARB (in fact I listen to BARB almost 24/7).
And I don't think that the albums are that different... I could never see why some prefer one of the CDs more than other...
And yes: we need a live DVD. I'm not feeling it watching it on YouTube. I need a Dvd to watch it on the telly including bonus material...

A friend of mine was like: what? 5 CDs and no Dvd? It's about time! Well said, I would say!!!!