Its like picking your favorate Led Zep song. It changes all the time. I would say the one thats not in my tank...lol. I had them all. I would say a dominant male A. Ethelwynnae with females are my fav. It barely has color on the body so the blue fins realy stand out.
I have had numerouse favorites and still have a greoup of 5 males in my 135, Ruby Red, Benga, Ngara Flametail, Red Shoulder and a Strawberry(hybred I know) But my new fav is a Red Top Lwanda. I am growing out a few F1's and Wilds so none are large enough to ad yet.
Thats the problem so to speak of peacocks, they are all awesome and have their own thing going for them.