I think true first appearance trumps first SA appearance in almost every case as well but when it comes to comparing Cap to DD and what Cap meant to Marvel in the 60's, 70's, 80's, 90's, 2 000's and now the movies I don't think there is a comparison. As far as covers go the Avengers 4 cover is considered Iconic based on the multiple cover swipes drawn from it paying homage to A4. I like how Daredevil section looks on the cover of DD 1 but when you have SPidey and the FF on there it takes away from the cover IMO.. That being said it is a very impt book for Marvel