I just listened to the cologne version I have again, and it IS terrific. Maybe I'm biased because I am from cologne (and I missed the show because I got my first Queen-tape from a friend 2 months later at the age of 10... I will regret that forever!) but that really is a great version, the audience is absolutely on spot and Freddie seems to enjoy himself a lot. The whole cologne show would've been a candidate for "Live Magic", the audience goes absolutely berserk from the first bar.
I also like the Knebworth version a lot. But even Wembley is nice, despite Freddie's voice. The fact that they played AOBTD always during daylight on that tour (apart from the few indoor-shows) seems to have added to the party-mood, because the band could actually see the audience dance and go wild.
Guten Tag und Guten Abend !!! We had a great time in Cologne. Drinking beer in the sunshine beside the Mighty Rhein brought back many memories for me..... (Brian May, 2004)