I too lean towards the afternoon show...by a considerable margin, actually. I think it would be easier to compare the two if we had a remastered release of the evening show though. "An Afternoon..." is superior soundwise by leaps and bounds.
That's one of the best CD covers ever, by the way.
And "As Recorded..." is the second Elvis CD I ever got, my first live one. I had similar first impressions as you did, NEA.