Everyone's tastes vary however for me, when I first tasted sugar apple and loved it. Then I tasted different atemoyas and really like them and thought sugar apples are just average and no big deal, even the raved about Big Red from Noel's tree. Then I had a number of ilamas and said this is top tier and better than both atemoya and sugar apples. Now that I have been eating top quality and top tier Cherimoyas from California, other than ilamas which I still believe are equally as good as many top Cherimoyas, sugar apples and most atemoyas are average.
Oh, and to me, all Rollinia I have had (I have not had any from Puerto Rico, Hawaii or anywhere else other than what has been grown in Florida) have been subpar. I have never had one that was more than a little sweet and taste was nothing that wanted to make me eat the whole fruit.
That being said, the fruit in the original post does not look like the Rollinia I have tasted so maybe its totally different.