Personally I don't think the two can be compared - both at different points of their career with different points to make...I guess it comes down topersonal preference.
Blood Red Sky was for me a live phenomenom...a live album AND video, maybe not the first ever but the first that captured my imagination at that particulartime...almost postponed because of the torrential rain, the 'boy' imagry in the backdrop and the haunting 'Harry's Game' prior to comingout on stage...the white flag during Sunday Bloody Sunday, the crowd shorus during "40"...
Rattle & Hum, their conquering of Americ